zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/lib/vsprintf.c b/ap/os/linux/linux-3.4.x/lib/vsprintf.c
new file mode 100644
index 0000000..cd0aab7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/lib/vsprintf.c
@@ -0,0 +1,2094 @@
+/*
+ * linux/lib/vsprintf.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
+/*
+ * Wirzenius wrote this portably, Torvalds fucked it up :-)
+ */
+
+/*
+ * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
+ * - changed to provide snprintf and vsnprintf functions
+ * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
+ * - scnprintf and vscnprintf
+ */
+
+#include <stdarg.h>
+#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+#include <linux/ioport.h>
+#include <linux/cred.h>
+#include <net/addrconf.h>
+
+#include <asm/page.h> /* for PAGE_SIZE */
+#include <asm/div64.h>
+#include <asm/sections.h> /* for dereference_function_descriptor() */
+
+#include "kstrtox.h"
+
+/**
+ * simple_strtoull - convert a string to an unsigned long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
+{
+ unsigned long long result;
+ unsigned int rv;
+
+ cp = _parse_integer_fixup_radix(cp, &base);
+ rv = _parse_integer(cp, base, &result);
+ /* FIXME */
+ cp += (rv & ~KSTRTOX_OVERFLOW);
+
+ if (endp)
+ *endp = (char *)cp;
+
+ return result;
+}
+EXPORT_SYMBOL(simple_strtoull);
+
+/**
+ * simple_strtoul - convert a string to an unsigned long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
+{
+ return simple_strtoull(cp, endp, base);
+}
+EXPORT_SYMBOL(simple_strtoul);
+
+/**
+ * simple_strtol - convert a string to a signed long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+long simple_strtol(const char *cp, char **endp, unsigned int base)
+{
+ if (*cp == '-')
+ return -simple_strtoul(cp + 1, endp, base);
+
+ return simple_strtoul(cp, endp, base);
+}
+EXPORT_SYMBOL(simple_strtol);
+
+/**
+ * simple_strtoll - convert a string to a signed long long
+ * @cp: The start of the string
+ * @endp: A pointer to the end of the parsed string will be placed here
+ * @base: The number base to use
+ */
+long long simple_strtoll(const char *cp, char **endp, unsigned int base)
+{
+ if (*cp == '-')
+ return -simple_strtoull(cp + 1, endp, base);
+
+ return simple_strtoull(cp, endp, base);
+}
+EXPORT_SYMBOL(simple_strtoll);
+
+static noinline_for_stack
+int skip_atoi(const char **s)
+{
+ int i = 0;
+
+ while (isdigit(**s))
+ i = i*10 + *((*s)++) - '0';
+
+ return i;
+}
+
+/* Decimal conversion is by far the most typical, and is used
+ * for /proc and /sys data. This directly impacts e.g. top performance
+ * with many processes running. We optimize it for speed
+ * using code from
+ * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
+ * (with permission from the author, Douglas W. Jones). */
+
+/* Formats correctly any integer in [0,99999].
+ * Outputs from one to five digits depending on input.
+ * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
+static noinline_for_stack
+char *put_dec_trunc(char *buf, unsigned q)
+{
+ unsigned d3, d2, d1, d0;
+ d1 = (q>>4) & 0xf;
+ d2 = (q>>8) & 0xf;
+ d3 = (q>>12);
+
+ d0 = 6*(d3 + d2 + d1) + (q & 0xf);
+ q = (d0 * 0xcd) >> 11;
+ d0 = d0 - 10*q;
+ *buf++ = d0 + '0'; /* least significant digit */
+ d1 = q + 9*d3 + 5*d2 + d1;
+ if (d1 != 0) {
+ q = (d1 * 0xcd) >> 11;
+ d1 = d1 - 10*q;
+ *buf++ = d1 + '0'; /* next digit */
+
+ d2 = q + 2*d2;
+ if ((d2 != 0) || (d3 != 0)) {
+ q = (d2 * 0xd) >> 7;
+ d2 = d2 - 10*q;
+ *buf++ = d2 + '0'; /* next digit */
+
+ d3 = q + 4*d3;
+ if (d3 != 0) {
+ q = (d3 * 0xcd) >> 11;
+ d3 = d3 - 10*q;
+ *buf++ = d3 + '0'; /* next digit */
+ if (q != 0)
+ *buf++ = q + '0'; /* most sign. digit */
+ }
+ }
+ }
+
+ return buf;
+}
+/* Same with if's removed. Always emits five digits */
+static noinline_for_stack
+char *put_dec_full(char *buf, unsigned q)
+{
+ /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
+ /* but anyway, gcc produces better code with full-sized ints */
+ unsigned d3, d2, d1, d0;
+ d1 = (q>>4) & 0xf;
+ d2 = (q>>8) & 0xf;
+ d3 = (q>>12);
+
+ /*
+ * Possible ways to approx. divide by 10
+ * gcc -O2 replaces multiply with shifts and adds
+ * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
+ * (x * 0x67) >> 10: 1100111
+ * (x * 0x34) >> 9: 110100 - same
+ * (x * 0x1a) >> 8: 11010 - same
+ * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
+ */
+ d0 = 6*(d3 + d2 + d1) + (q & 0xf);
+ q = (d0 * 0xcd) >> 11;
+ d0 = d0 - 10*q;
+ *buf++ = d0 + '0';
+ d1 = q + 9*d3 + 5*d2 + d1;
+ q = (d1 * 0xcd) >> 11;
+ d1 = d1 - 10*q;
+ *buf++ = d1 + '0';
+
+ d2 = q + 2*d2;
+ q = (d2 * 0xd) >> 7;
+ d2 = d2 - 10*q;
+ *buf++ = d2 + '0';
+
+ d3 = q + 4*d3;
+ q = (d3 * 0xcd) >> 11; /* - shorter code */
+ /* q = (d3 * 0x67) >> 10; - would also work */
+ d3 = d3 - 10*q;
+ *buf++ = d3 + '0';
+ *buf++ = q + '0';
+
+ return buf;
+}
+/* No inlining helps gcc to use registers better */
+static noinline_for_stack
+char *put_dec(char *buf, unsigned long long num)
+{
+ while (1) {
+ unsigned rem;
+ if (num < 100000)
+ return put_dec_trunc(buf, num);
+ rem = do_div(num, 100000);
+ buf = put_dec_full(buf, rem);
+ }
+}
+
+/*
+ * Convert passed number to decimal string.
+ * Returns the length of string. On buffer overflow, returns 0.
+ *
+ * If speed is not important, use snprintf(). It's easy to read the code.
+ */
+int num_to_str(char *buf, int size, unsigned long long num)
+{
+ char tmp[21]; /* Enough for 2^64 in decimal */
+ int idx, len;
+
+ len = put_dec(tmp, num) - tmp;
+
+ if (len > size)
+ return 0;
+ for (idx = 0; idx < len; ++idx)
+ buf[idx] = tmp[len - idx - 1];
+ return len;
+}
+
+#define ZEROPAD 1 /* pad with zero */
+#define SIGN 2 /* unsigned/signed long */
+#define PLUS 4 /* show plus */
+#define SPACE 8 /* space if plus */
+#define LEFT 16 /* left justified */
+#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
+#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
+
+enum format_type {
+ FORMAT_TYPE_NONE, /* Just a string part */
+ FORMAT_TYPE_WIDTH,
+ FORMAT_TYPE_PRECISION,
+ FORMAT_TYPE_CHAR,
+ FORMAT_TYPE_STR,
+ FORMAT_TYPE_PTR,
+ FORMAT_TYPE_PERCENT_CHAR,
+ FORMAT_TYPE_INVALID,
+ FORMAT_TYPE_LONG_LONG,
+ FORMAT_TYPE_ULONG,
+ FORMAT_TYPE_LONG,
+ FORMAT_TYPE_UBYTE,
+ FORMAT_TYPE_BYTE,
+ FORMAT_TYPE_USHORT,
+ FORMAT_TYPE_SHORT,
+ FORMAT_TYPE_UINT,
+ FORMAT_TYPE_INT,
+ FORMAT_TYPE_NRCHARS,
+ FORMAT_TYPE_SIZE_T,
+ FORMAT_TYPE_PTRDIFF
+};
+
+struct printf_spec {
+ u8 type; /* format_type enum */
+ u8 flags; /* flags to number() */
+ u8 base; /* number base, 8, 10 or 16 only */
+ u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
+ s16 field_width; /* width of output field */
+ s16 precision; /* # of digits/chars */
+};
+
+static noinline_for_stack
+char *number(char *buf, char *end, unsigned long long num,
+ struct printf_spec spec)
+{
+ /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
+ static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
+
+ char tmp[66];
+ char sign;
+ char locase;
+ int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
+ int i;
+
+ /* locase = 0 or 0x20. ORing digits or letters with 'locase'
+ * produces same digits or (maybe lowercased) letters */
+ locase = (spec.flags & SMALL);
+ if (spec.flags & LEFT)
+ spec.flags &= ~ZEROPAD;
+ sign = 0;
+ if (spec.flags & SIGN) {
+ if ((signed long long)num < 0) {
+ sign = '-';
+ num = -(signed long long)num;
+ spec.field_width--;
+ } else if (spec.flags & PLUS) {
+ sign = '+';
+ spec.field_width--;
+ } else if (spec.flags & SPACE) {
+ sign = ' ';
+ spec.field_width--;
+ }
+ }
+ if (need_pfx) {
+ spec.field_width--;
+ if (spec.base == 16)
+ spec.field_width--;
+ }
+
+ /* generate full string in tmp[], in reverse order */
+ i = 0;
+ if (num == 0)
+ tmp[i++] = '0';
+ /* Generic code, for any base:
+ else do {
+ tmp[i++] = (digits[do_div(num,base)] | locase);
+ } while (num != 0);
+ */
+ else if (spec.base != 10) { /* 8 or 16 */
+ int mask = spec.base - 1;
+ int shift = 3;
+
+ if (spec.base == 16)
+ shift = 4;
+ do {
+ tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
+ num >>= shift;
+ } while (num);
+ } else { /* base 10 */
+ i = put_dec(tmp, num) - tmp;
+ }
+
+ /* printing 100 using %2d gives "100", not "00" */
+ if (i > spec.precision)
+ spec.precision = i;
+ /* leading space padding */
+ spec.field_width -= spec.precision;
+ if (!(spec.flags & (ZEROPAD+LEFT))) {
+ while (--spec.field_width >= 0) {
+ if (buf < end)
+ *buf = ' ';
+ ++buf;
+ }
+ }
+ /* sign */
+ if (sign) {
+ if (buf < end)
+ *buf = sign;
+ ++buf;
+ }
+ /* "0x" / "0" prefix */
+ if (need_pfx) {
+ if (buf < end)
+ *buf = '0';
+ ++buf;
+ if (spec.base == 16) {
+ if (buf < end)
+ *buf = ('X' | locase);
+ ++buf;
+ }
+ }
+ /* zero or space padding */
+ if (!(spec.flags & LEFT)) {
+ char c = (spec.flags & ZEROPAD) ? '0' : ' ';
+ while (--spec.field_width >= 0) {
+ if (buf < end)
+ *buf = c;
+ ++buf;
+ }
+ }
+ /* hmm even more zero padding? */
+ while (i <= --spec.precision) {
+ if (buf < end)
+ *buf = '0';
+ ++buf;
+ }
+ /* actual digits of result */
+ while (--i >= 0) {
+ if (buf < end)
+ *buf = tmp[i];
+ ++buf;
+ }
+ /* trailing space padding */
+ while (--spec.field_width >= 0) {
+ if (buf < end)
+ *buf = ' ';
+ ++buf;
+ }
+
+ return buf;
+}
+
+static noinline_for_stack
+char *string(char *buf, char *end, const char *s, struct printf_spec spec)
+{
+ int len, i;
+
+ if ((unsigned long)s < PAGE_SIZE)
+ s = "(null)";
+
+ len = strnlen(s, spec.precision);
+
+ if (!(spec.flags & LEFT)) {
+ while (len < spec.field_width--) {
+ if (buf < end)
+ *buf = ' ';
+ ++buf;
+ }
+ }
+ for (i = 0; i < len; ++i) {
+ if (buf < end)
+ *buf = *s;
+ ++buf; ++s;
+ }
+ while (len < spec.field_width--) {
+ if (buf < end)
+ *buf = ' ';
+ ++buf;
+ }
+
+ return buf;
+}
+
+static noinline_for_stack
+char *symbol_string(char *buf, char *end, void *ptr,
+ struct printf_spec spec, char ext)
+{
+ unsigned long value = (unsigned long) ptr;
+#ifdef CONFIG_KALLSYMS
+ char sym[KSYM_SYMBOL_LEN];
+ if (ext == 'B')
+ sprint_backtrace(sym, value);
+ else if (ext != 'f' && ext != 's')
+ sprint_symbol(sym, value);
+ else
+ kallsyms_lookup(value, NULL, NULL, NULL, sym);
+
+ return string(buf, end, sym, spec);
+#else
+ spec.field_width = 2 * sizeof(void *);
+ spec.flags |= SPECIAL | SMALL | ZEROPAD;
+ spec.base = 16;
+
+ return number(buf, end, value, spec);
+#endif
+}
+
+static noinline_for_stack
+char *resource_string(char *buf, char *end, struct resource *res,
+ struct printf_spec spec, const char *fmt)
+{
+#ifndef IO_RSRC_PRINTK_SIZE
+#define IO_RSRC_PRINTK_SIZE 6
+#endif
+
+#ifndef MEM_RSRC_PRINTK_SIZE
+#define MEM_RSRC_PRINTK_SIZE 10
+#endif
+ static const struct printf_spec io_spec = {
+ .base = 16,
+ .field_width = IO_RSRC_PRINTK_SIZE,
+ .precision = -1,
+ .flags = SPECIAL | SMALL | ZEROPAD,
+ };
+ static const struct printf_spec mem_spec = {
+ .base = 16,
+ .field_width = MEM_RSRC_PRINTK_SIZE,
+ .precision = -1,
+ .flags = SPECIAL | SMALL | ZEROPAD,
+ };
+ static const struct printf_spec bus_spec = {
+ .base = 16,
+ .field_width = 2,
+ .precision = -1,
+ .flags = SMALL | ZEROPAD,
+ };
+ static const struct printf_spec dec_spec = {
+ .base = 10,
+ .precision = -1,
+ .flags = 0,
+ };
+ static const struct printf_spec str_spec = {
+ .field_width = -1,
+ .precision = 10,
+ .flags = LEFT,
+ };
+ static const struct printf_spec flag_spec = {
+ .base = 16,
+ .precision = -1,
+ .flags = SPECIAL | SMALL,
+ };
+
+ /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
+ * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
+#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
+#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
+#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
+#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
+ char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
+ 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
+
+ char *p = sym, *pend = sym + sizeof(sym);
+ int decode = (fmt[0] == 'R') ? 1 : 0;
+ const struct printf_spec *specp;
+
+ *p++ = '[';
+ if (res->flags & IORESOURCE_IO) {
+ p = string(p, pend, "io ", str_spec);
+ specp = &io_spec;
+ } else if (res->flags & IORESOURCE_MEM) {
+ p = string(p, pend, "mem ", str_spec);
+ specp = &mem_spec;
+ } else if (res->flags & IORESOURCE_IRQ) {
+ p = string(p, pend, "irq ", str_spec);
+ specp = &dec_spec;
+ } else if (res->flags & IORESOURCE_DMA) {
+ p = string(p, pend, "dma ", str_spec);
+ specp = &dec_spec;
+ } else if (res->flags & IORESOURCE_BUS) {
+ p = string(p, pend, "bus ", str_spec);
+ specp = &bus_spec;
+ } else {
+ p = string(p, pend, "??? ", str_spec);
+ specp = &mem_spec;
+ decode = 0;
+ }
+ p = number(p, pend, res->start, *specp);
+ if (res->start != res->end) {
+ *p++ = '-';
+ p = number(p, pend, res->end, *specp);
+ }
+ if (decode) {
+ if (res->flags & IORESOURCE_MEM_64)
+ p = string(p, pend, " 64bit", str_spec);
+ if (res->flags & IORESOURCE_PREFETCH)
+ p = string(p, pend, " pref", str_spec);
+ if (res->flags & IORESOURCE_WINDOW)
+ p = string(p, pend, " window", str_spec);
+ if (res->flags & IORESOURCE_DISABLED)
+ p = string(p, pend, " disabled", str_spec);
+ } else {
+ p = string(p, pend, " flags ", str_spec);
+ p = number(p, pend, res->flags, flag_spec);
+ }
+ *p++ = ']';
+ *p = '\0';
+
+ return string(buf, end, sym, spec);
+}
+
+static noinline_for_stack
+char *mac_address_string(char *buf, char *end, u8 *addr,
+ struct printf_spec spec, const char *fmt)
+{
+ char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
+ char *p = mac_addr;
+ int i;
+ char separator;
+
+ if (fmt[1] == 'F') { /* FDDI canonical format */
+ separator = '-';
+ } else {
+ separator = ':';
+ }
+
+ for (i = 0; i < 6; i++) {
+ p = hex_byte_pack(p, addr[i]);
+ if (fmt[0] == 'M' && i != 5)
+ *p++ = separator;
+ }
+ *p = '\0';
+
+ return string(buf, end, mac_addr, spec);
+}
+
+static noinline_for_stack
+char *ip4_string(char *p, const u8 *addr, const char *fmt)
+{
+ int i;
+ bool leading_zeros = (fmt[0] == 'i');
+ int index;
+ int step;
+
+ switch (fmt[2]) {
+ case 'h':
+#ifdef __BIG_ENDIAN
+ index = 0;
+ step = 1;
+#else
+ index = 3;
+ step = -1;
+#endif
+ break;
+ case 'l':
+ index = 3;
+ step = -1;
+ break;
+ case 'n':
+ case 'b':
+ default:
+ index = 0;
+ step = 1;
+ break;
+ }
+ for (i = 0; i < 4; i++) {
+ char temp[3]; /* hold each IP quad in reverse order */
+ int digits = put_dec_trunc(temp, addr[index]) - temp;
+ if (leading_zeros) {
+ if (digits < 3)
+ *p++ = '0';
+ if (digits < 2)
+ *p++ = '0';
+ }
+ /* reverse the digits in the quad */
+ while (digits--)
+ *p++ = temp[digits];
+ if (i < 3)
+ *p++ = '.';
+ index += step;
+ }
+ *p = '\0';
+
+ return p;
+}
+
+static noinline_for_stack
+char *ip6_compressed_string(char *p, const char *addr)
+{
+ int i, j, range;
+ unsigned char zerolength[8];
+ int longest = 1;
+ int colonpos = -1;
+ u16 word;
+ u8 hi, lo;
+ bool needcolon = false;
+ bool useIPv4;
+ struct in6_addr in6;
+
+ memcpy(&in6, addr, sizeof(struct in6_addr));
+
+ useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
+
+ memset(zerolength, 0, sizeof(zerolength));
+
+ if (useIPv4)
+ range = 6;
+ else
+ range = 8;
+
+ /* find position of longest 0 run */
+ for (i = 0; i < range; i++) {
+ for (j = i; j < range; j++) {
+ if (in6.s6_addr16[j] != 0)
+ break;
+ zerolength[i]++;
+ }
+ }
+ for (i = 0; i < range; i++) {
+ if (zerolength[i] > longest) {
+ longest = zerolength[i];
+ colonpos = i;
+ }
+ }
+ if (longest == 1) /* don't compress a single 0 */
+ colonpos = -1;
+
+ /* emit address */
+ for (i = 0; i < range; i++) {
+ if (i == colonpos) {
+ if (needcolon || i == 0)
+ *p++ = ':';
+ *p++ = ':';
+ needcolon = false;
+ i += longest - 1;
+ continue;
+ }
+ if (needcolon) {
+ *p++ = ':';
+ needcolon = false;
+ }
+ /* hex u16 without leading 0s */
+ word = ntohs(in6.s6_addr16[i]);
+ hi = word >> 8;
+ lo = word & 0xff;
+ if (hi) {
+ if (hi > 0x0f)
+ p = hex_byte_pack(p, hi);
+ else
+ *p++ = hex_asc_lo(hi);
+ p = hex_byte_pack(p, lo);
+ }
+ else if (lo > 0x0f)
+ p = hex_byte_pack(p, lo);
+ else
+ *p++ = hex_asc_lo(lo);
+ needcolon = true;
+ }
+
+ if (useIPv4) {
+ if (needcolon)
+ *p++ = ':';
+ p = ip4_string(p, &in6.s6_addr[12], "I4");
+ }
+ *p = '\0';
+
+ return p;
+}
+
+static noinline_for_stack
+char *ip6_string(char *p, const char *addr, const char *fmt)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ p = hex_byte_pack(p, *addr++);
+ p = hex_byte_pack(p, *addr++);
+ if (fmt[0] == 'I' && i != 7)
+ *p++ = ':';
+ }
+ *p = '\0';
+
+ return p;
+}
+
+static noinline_for_stack
+char *ip6_addr_string(char *buf, char *end, const u8 *addr,
+ struct printf_spec spec, const char *fmt)
+{
+ char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
+
+ if (fmt[0] == 'I' && fmt[2] == 'c')
+ ip6_compressed_string(ip6_addr, addr);
+ else
+ ip6_string(ip6_addr, addr, fmt);
+
+ return string(buf, end, ip6_addr, spec);
+}
+
+static noinline_for_stack
+char *ip4_addr_string(char *buf, char *end, const u8 *addr,
+ struct printf_spec spec, const char *fmt)
+{
+ char ip4_addr[sizeof("255.255.255.255")];
+
+ ip4_string(ip4_addr, addr, fmt);
+
+ return string(buf, end, ip4_addr, spec);
+}
+
+static noinline_for_stack
+char *uuid_string(char *buf, char *end, const u8 *addr,
+ struct printf_spec spec, const char *fmt)
+{
+ char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
+ char *p = uuid;
+ int i;
+ static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+ static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
+ const u8 *index = be;
+ bool uc = false;
+
+ switch (*(++fmt)) {
+ case 'L':
+ uc = true; /* fall-through */
+ case 'l':
+ index = le;
+ break;
+ case 'B':
+ uc = true;
+ break;
+ }
+
+ for (i = 0; i < 16; i++) {
+ p = hex_byte_pack(p, addr[index[i]]);
+ switch (i) {
+ case 3:
+ case 5:
+ case 7:
+ case 9:
+ *p++ = '-';
+ break;
+ }
+ }
+
+ *p = 0;
+
+ if (uc) {
+ p = uuid;
+ do {
+ *p = toupper(*p);
+ } while (*(++p));
+ }
+
+ return string(buf, end, uuid, spec);
+}
+
+static
+char *netdev_feature_string(char *buf, char *end, const u8 *addr,
+ struct printf_spec spec)
+{
+ spec.flags |= SPECIAL | SMALL | ZEROPAD;
+ if (spec.field_width == -1)
+ spec.field_width = 2 + 2 * sizeof(netdev_features_t);
+ spec.base = 16;
+
+ return number(buf, end, *(const netdev_features_t *)addr, spec);
+}
+
+int kptr_restrict __read_mostly;
+
+/*
+ * Show a '%p' thing. A kernel extension is that the '%p' is followed
+ * by an extra set of alphanumeric characters that are extended format
+ * specifiers.
+ *
+ * Right now we handle:
+ *
+ * - 'F' For symbolic function descriptor pointers with offset
+ * - 'f' For simple symbolic function names without offset
+ * - 'S' For symbolic direct pointers with offset
+ * - 's' For symbolic direct pointers without offset
+ * - 'B' For backtraced symbolic direct pointers with offset
+ * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
+ * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
+ * - 'M' For a 6-byte MAC address, it prints the address in the
+ * usual colon-separated hex notation
+ * - 'm' For a 6-byte MAC address, it prints the hex address without colons
+ * - 'MF' For a 6-byte MAC FDDI address, it prints the address
+ * with a dash-separated hex notation
+ * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
+ * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
+ * IPv6 uses colon separated network-order 16 bit hex with leading 0's
+ * - 'i' [46] for 'raw' IPv4/IPv6 addresses
+ * IPv6 omits the colons (01020304...0f)
+ * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
+ * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
+ * - 'I6c' for IPv6 addresses printed as specified by
+ * http://tools.ietf.org/html/rfc5952
+ * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
+ * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+ * Options for %pU are:
+ * b big endian lower case hex (default)
+ * B big endian UPPER case hex
+ * l little endian lower case hex
+ * L little endian UPPER case hex
+ * big endian output byte order is:
+ * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
+ * little endian output byte order is:
+ * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
+ * - 'V' For a struct va_format which contains a format string * and va_list *,
+ * call vsnprintf(->format, *->va_list).
+ * Implements a "recursive vsnprintf".
+ * Do not use this feature without some mechanism to verify the
+ * correctness of the format string and va_list arguments.
+ * - 'K' For a kernel pointer that should be hidden from unprivileged users
+ * - 'NF' For a netdev_features_t
+ *
+ * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
+ * function pointers are really function descriptors, which contain a
+ * pointer to the real address.
+ */
+static noinline_for_stack
+char *pointer(const char *fmt, char *buf, char *end, void *ptr,
+ struct printf_spec spec)
+{
+ if (!ptr && *fmt != 'K') {
+ /*
+ * Print (null) with the same width as a pointer so it makes
+ * tabular output look nice.
+ */
+ if (spec.field_width == -1)
+ spec.field_width = 2 * sizeof(void *);
+ return string(buf, end, "(null)", spec);
+ }
+
+ switch (*fmt) {
+ case 'F':
+ case 'f':
+ ptr = dereference_function_descriptor(ptr);
+ /* Fallthrough */
+ case 'S':
+ case 's':
+ case 'B':
+ return symbol_string(buf, end, ptr, spec, *fmt);
+ case 'R':
+ case 'r':
+ return resource_string(buf, end, ptr, spec, fmt);
+ case 'M': /* Colon separated: 00:01:02:03:04:05 */
+ case 'm': /* Contiguous: 000102030405 */
+ /* [mM]F (FDDI, bit reversed) */
+ return mac_address_string(buf, end, ptr, spec, fmt);
+ case 'I': /* Formatted IP supported
+ * 4: 1.2.3.4
+ * 6: 0001:0203:...:0708
+ * 6c: 1::708 or 1::1.2.3.4
+ */
+ case 'i': /* Contiguous:
+ * 4: 001.002.003.004
+ * 6: 000102...0f
+ */
+ switch (fmt[1]) {
+ case '6':
+ return ip6_addr_string(buf, end, ptr, spec, fmt);
+ case '4':
+ return ip4_addr_string(buf, end, ptr, spec, fmt);
+ }
+ break;
+ case 'U':
+ return uuid_string(buf, end, ptr, spec, fmt);
+ case 'V':
+ {
+ va_list va;
+
+ va_copy(va, *((struct va_format *)ptr)->va);
+ buf += vsnprintf(buf, end > buf ? end - buf : 0,
+ ((struct va_format *)ptr)->fmt, va);
+ va_end(va);
+ return buf;
+ }
+ case 'K':
+ /*
+ * %pK cannot be used in IRQ context because its test
+ * for CAP_SYSLOG would be meaningless.
+ */
+ if (kptr_restrict && (in_irq() || in_serving_softirq() ||
+ in_nmi())) {
+ if (spec.field_width == -1)
+ spec.field_width = 2 * sizeof(void *);
+ return string(buf, end, "pK-error", spec);
+ }
+
+ switch (kptr_restrict) {
+ case 0:
+ /* Always print %pK values */
+ break;
+ case 1: {
+ /*
+ * Only print the real pointer value if the current
+ * process has CAP_SYSLOG and is running with the
+ * same credentials it started with. This is because
+ * access to files is checked at open() time, but %pK
+ * checks permission at read() time. We don't want to
+ * leak pointer values if a binary opens a file using
+ * %pK and then elevates privileges before reading it.
+ */
+ const struct cred *cred = current_cred();
+
+ if (!has_capability_noaudit(current, CAP_SYSLOG) ||
+ (cred->euid != cred->uid) ||
+ (cred->egid != cred->gid))
+ ptr = NULL;
+ break;
+ }
+ case 2:
+ default:
+ /* Always print 0's for %pK */
+ ptr = NULL;
+ break;
+ }
+ break;
+
+ case 'N':
+ switch (fmt[1]) {
+ case 'F':
+ return netdev_feature_string(buf, end, ptr, spec);
+ }
+ break;
+ }
+ spec.flags |= SMALL;
+ if (spec.field_width == -1) {
+ spec.field_width = 2 * sizeof(void *);
+ spec.flags |= ZEROPAD;
+ }
+ spec.base = 16;
+
+ return number(buf, end, (unsigned long) ptr, spec);
+}
+
+/*
+ * Helper function to decode printf style format.
+ * Each call decode a token from the format and return the
+ * number of characters read (or likely the delta where it wants
+ * to go on the next call).
+ * The decoded token is returned through the parameters
+ *
+ * 'h', 'l', or 'L' for integer fields
+ * 'z' support added 23/7/1999 S.H.
+ * 'z' changed to 'Z' --davidm 1/25/99
+ * 't' added for ptrdiff_t
+ *
+ * @fmt: the format string
+ * @type of the token returned
+ * @flags: various flags such as +, -, # tokens..
+ * @field_width: overwritten width
+ * @base: base of the number (octal, hex, ...)
+ * @precision: precision of a number
+ * @qualifier: qualifier of a number (long, size_t, ...)
+ */
+static noinline_for_stack
+int format_decode(const char *fmt, struct printf_spec *spec)
+{
+ const char *start = fmt;
+
+ /* we finished early by reading the field width */
+ if (spec->type == FORMAT_TYPE_WIDTH) {
+ if (spec->field_width < 0) {
+ spec->field_width = -spec->field_width;
+ spec->flags |= LEFT;
+ }
+ spec->type = FORMAT_TYPE_NONE;
+ goto precision;
+ }
+
+ /* we finished early by reading the precision */
+ if (spec->type == FORMAT_TYPE_PRECISION) {
+ if (spec->precision < 0)
+ spec->precision = 0;
+
+ spec->type = FORMAT_TYPE_NONE;
+ goto qualifier;
+ }
+
+ /* By default */
+ spec->type = FORMAT_TYPE_NONE;
+
+ for (; *fmt ; ++fmt) {
+ if (*fmt == '%')
+ break;
+ }
+
+ /* Return the current non-format string */
+ if (fmt != start || !*fmt)
+ return fmt - start;
+
+ /* Process flags */
+ spec->flags = 0;
+
+ while (1) { /* this also skips first '%' */
+ bool found = true;
+
+ ++fmt;
+
+ switch (*fmt) {
+ case '-': spec->flags |= LEFT; break;
+ case '+': spec->flags |= PLUS; break;
+ case ' ': spec->flags |= SPACE; break;
+ case '#': spec->flags |= SPECIAL; break;
+ case '0': spec->flags |= ZEROPAD; break;
+ default: found = false;
+ }
+
+ if (!found)
+ break;
+ }
+
+ /* get field width */
+ spec->field_width = -1;
+
+ if (isdigit(*fmt))
+ spec->field_width = skip_atoi(&fmt);
+ else if (*fmt == '*') {
+ /* it's the next argument */
+ spec->type = FORMAT_TYPE_WIDTH;
+ return ++fmt - start;
+ }
+
+precision:
+ /* get the precision */
+ spec->precision = -1;
+ if (*fmt == '.') {
+ ++fmt;
+ if (isdigit(*fmt)) {
+ spec->precision = skip_atoi(&fmt);
+ if (spec->precision < 0)
+ spec->precision = 0;
+ } else if (*fmt == '*') {
+ /* it's the next argument */
+ spec->type = FORMAT_TYPE_PRECISION;
+ return ++fmt - start;
+ }
+ }
+
+qualifier:
+ /* get the conversion qualifier */
+ spec->qualifier = -1;
+ if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
+ _tolower(*fmt) == 'z' || *fmt == 't') {
+ spec->qualifier = *fmt++;
+ if (unlikely(spec->qualifier == *fmt)) {
+ if (spec->qualifier == 'l') {
+ spec->qualifier = 'L';
+ ++fmt;
+ } else if (spec->qualifier == 'h') {
+ spec->qualifier = 'H';
+ ++fmt;
+ }
+ }
+ }
+
+ /* default base */
+ spec->base = 10;
+ switch (*fmt) {
+ case 'c':
+ spec->type = FORMAT_TYPE_CHAR;
+ return ++fmt - start;
+
+ case 's':
+ spec->type = FORMAT_TYPE_STR;
+ return ++fmt - start;
+
+ case 'p':
+ spec->type = FORMAT_TYPE_PTR;
+ return fmt - start;
+ /* skip alnum */
+
+ case 'n':
+ spec->type = FORMAT_TYPE_NRCHARS;
+ return ++fmt - start;
+
+ case '%':
+ spec->type = FORMAT_TYPE_PERCENT_CHAR;
+ return ++fmt - start;
+
+ /* integer number formats - set up the flags and "break" */
+ case 'o':
+ spec->base = 8;
+ break;
+
+ case 'x':
+ spec->flags |= SMALL;
+
+ case 'X':
+ spec->base = 16;
+ break;
+
+ case 'd':
+ case 'i':
+ spec->flags |= SIGN;
+ case 'u':
+ break;
+
+ default:
+ spec->type = FORMAT_TYPE_INVALID;
+ return fmt - start;
+ }
+
+ if (spec->qualifier == 'L')
+ spec->type = FORMAT_TYPE_LONG_LONG;
+ else if (spec->qualifier == 'l') {
+ if (spec->flags & SIGN)
+ spec->type = FORMAT_TYPE_LONG;
+ else
+ spec->type = FORMAT_TYPE_ULONG;
+ } else if (_tolower(spec->qualifier) == 'z') {
+ spec->type = FORMAT_TYPE_SIZE_T;
+ } else if (spec->qualifier == 't') {
+ spec->type = FORMAT_TYPE_PTRDIFF;
+ } else if (spec->qualifier == 'H') {
+ if (spec->flags & SIGN)
+ spec->type = FORMAT_TYPE_BYTE;
+ else
+ spec->type = FORMAT_TYPE_UBYTE;
+ } else if (spec->qualifier == 'h') {
+ if (spec->flags & SIGN)
+ spec->type = FORMAT_TYPE_SHORT;
+ else
+ spec->type = FORMAT_TYPE_USHORT;
+ } else {
+ if (spec->flags & SIGN)
+ spec->type = FORMAT_TYPE_INT;
+ else
+ spec->type = FORMAT_TYPE_UINT;
+ }
+
+ return ++fmt - start;
+}
+
+/**
+ * vsnprintf - Format a string and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @size: The size of the buffer, including the trailing null space
+ * @fmt: The format string to use
+ * @args: Arguments for the format string
+ *
+ * This function follows C99 vsnprintf, but has some extensions:
+ * %pS output the name of a text symbol with offset
+ * %ps output the name of a text symbol without offset
+ * %pF output the name of a function pointer with its offset
+ * %pf output the name of a function pointer without its offset
+ * %pB output the name of a backtrace symbol with its offset
+ * %pR output the address range in a struct resource with decoded flags
+ * %pr output the address range in a struct resource with raw flags
+ * %pM output a 6-byte MAC address with colons
+ * %pm output a 6-byte MAC address without colons
+ * %pI4 print an IPv4 address without leading zeros
+ * %pi4 print an IPv4 address with leading zeros
+ * %pI6 print an IPv6 address with colons
+ * %pi6 print an IPv6 address without colons
+ * %pI6c print an IPv6 address as specified by RFC 5952
+ * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
+ * case.
+ * %n is ignored
+ *
+ * The return value is the number of characters which would
+ * be generated for the given input, excluding the trailing
+ * '\0', as per ISO C99. If you want to have the exact
+ * number of characters written into @buf as return value
+ * (not including the trailing '\0'), use vscnprintf(). If the
+ * return is greater than or equal to @size, the resulting
+ * string is truncated.
+ *
+ * If you're not already dealing with a va_list consider using snprintf().
+ */
+int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
+{
+ unsigned long long num;
+ char *str, *end;
+ struct printf_spec spec = {0};
+
+ /* Reject out-of-range values early. Large positive sizes are
+ used for unknown buffer sizes. */
+ if (WARN_ON_ONCE((int) size < 0))
+ return 0;
+
+ str = buf;
+ end = buf + size;
+
+ /* Make sure end is always >= buf */
+ if (end < buf) {
+ end = ((void *)-1);
+ size = end - buf;
+ }
+
+ while (*fmt) {
+ const char *old_fmt = fmt;
+ int read = format_decode(fmt, &spec);
+
+ fmt += read;
+
+ switch (spec.type) {
+ case FORMAT_TYPE_NONE: {
+ int copy = read;
+ if (str < end) {
+ if (copy > end - str)
+ copy = end - str;
+ memcpy(str, old_fmt, copy);
+ }
+ str += read;
+ break;
+ }
+
+ case FORMAT_TYPE_WIDTH:
+ spec.field_width = va_arg(args, int);
+ break;
+
+ case FORMAT_TYPE_PRECISION:
+ spec.precision = va_arg(args, int);
+ break;
+
+ case FORMAT_TYPE_CHAR: {
+ char c;
+
+ if (!(spec.flags & LEFT)) {
+ while (--spec.field_width > 0) {
+ if (str < end)
+ *str = ' ';
+ ++str;
+
+ }
+ }
+ c = (unsigned char) va_arg(args, int);
+ if (str < end)
+ *str = c;
+ ++str;
+ while (--spec.field_width > 0) {
+ if (str < end)
+ *str = ' ';
+ ++str;
+ }
+ break;
+ }
+
+ case FORMAT_TYPE_STR:
+ str = string(str, end, va_arg(args, char *), spec);
+ break;
+
+ case FORMAT_TYPE_PTR:
+ str = pointer(fmt+1, str, end, va_arg(args, void *),
+ spec);
+ while (isalnum(*fmt))
+ fmt++;
+ break;
+
+ case FORMAT_TYPE_PERCENT_CHAR:
+ if (str < end)
+ *str = '%';
+ ++str;
+ break;
+
+ case FORMAT_TYPE_INVALID:
+ if (str < end)
+ *str = '%';
+ ++str;
+ break;
+
+ case FORMAT_TYPE_NRCHARS: {
+ u8 qualifier = spec.qualifier;
+
+ if (qualifier == 'l') {
+ long *ip = va_arg(args, long *);
+ *ip = (str - buf);
+ } else if (_tolower(qualifier) == 'z') {
+ size_t *ip = va_arg(args, size_t *);
+ *ip = (str - buf);
+ } else {
+ int *ip = va_arg(args, int *);
+ *ip = (str - buf);
+ }
+ break;
+ }
+
+ default:
+ switch (spec.type) {
+ case FORMAT_TYPE_LONG_LONG:
+ num = va_arg(args, long long);
+ break;
+ case FORMAT_TYPE_ULONG:
+ num = va_arg(args, unsigned long);
+ break;
+ case FORMAT_TYPE_LONG:
+ num = va_arg(args, long);
+ break;
+ case FORMAT_TYPE_SIZE_T:
+ num = va_arg(args, size_t);
+ break;
+ case FORMAT_TYPE_PTRDIFF:
+ num = va_arg(args, ptrdiff_t);
+ break;
+ case FORMAT_TYPE_UBYTE:
+ num = (unsigned char) va_arg(args, int);
+ break;
+ case FORMAT_TYPE_BYTE:
+ num = (signed char) va_arg(args, int);
+ break;
+ case FORMAT_TYPE_USHORT:
+ num = (unsigned short) va_arg(args, int);
+ break;
+ case FORMAT_TYPE_SHORT:
+ num = (short) va_arg(args, int);
+ break;
+ case FORMAT_TYPE_INT:
+ num = (int) va_arg(args, int);
+ break;
+ default:
+ num = va_arg(args, unsigned int);
+ }
+
+ str = number(str, end, num, spec);
+ }
+ }
+
+ if (size > 0) {
+ if (str < end)
+ *str = '\0';
+ else
+ end[-1] = '\0';
+ }
+
+ /* the trailing null byte doesn't count towards the total */
+ return str-buf;
+
+}
+EXPORT_SYMBOL(vsnprintf);
+
+/**
+ * vscnprintf - Format a string and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @size: The size of the buffer, including the trailing null space
+ * @fmt: The format string to use
+ * @args: Arguments for the format string
+ *
+ * The return value is the number of characters which have been written into
+ * the @buf not including the trailing '\0'. If @size is == 0 the function
+ * returns 0.
+ *
+ * If you're not already dealing with a va_list consider using scnprintf().
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
+ */
+int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
+{
+ int i;
+
+ i = vsnprintf(buf, size, fmt, args);
+
+ if (likely(i < size))
+ return i;
+ if (size != 0)
+ return size - 1;
+ return 0;
+}
+EXPORT_SYMBOL(vscnprintf);
+
+/**
+ * snprintf - Format a string and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @size: The size of the buffer, including the trailing null space
+ * @fmt: The format string to use
+ * @...: Arguments for the format string
+ *
+ * The return value is the number of characters which would be
+ * generated for the given input, excluding the trailing null,
+ * as per ISO C99. If the return is greater than or equal to
+ * @size, the resulting string is truncated.
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
+ */
+int snprintf(char *buf, size_t size, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i = vsnprintf(buf, size, fmt, args);
+ va_end(args);
+
+ return i;
+}
+EXPORT_SYMBOL(snprintf);
+
+/**
+ * scnprintf - Format a string and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @size: The size of the buffer, including the trailing null space
+ * @fmt: The format string to use
+ * @...: Arguments for the format string
+ *
+ * The return value is the number of characters written into @buf not including
+ * the trailing '\0'. If @size is == 0 the function returns 0.
+ */
+
+int scnprintf(char *buf, size_t size, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i = vscnprintf(buf, size, fmt, args);
+ va_end(args);
+
+ return i;
+}
+EXPORT_SYMBOL(scnprintf);
+
+/**
+ * vsprintf - Format a string and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @fmt: The format string to use
+ * @args: Arguments for the format string
+ *
+ * The function returns the number of characters written
+ * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
+ * buffer overflows.
+ *
+ * If you're not already dealing with a va_list consider using sprintf().
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
+ */
+int vsprintf(char *buf, const char *fmt, va_list args)
+{
+ return vsnprintf(buf, INT_MAX, fmt, args);
+}
+EXPORT_SYMBOL(vsprintf);
+
+/**
+ * sprintf - Format a string and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @fmt: The format string to use
+ * @...: Arguments for the format string
+ *
+ * The function returns the number of characters written
+ * into @buf. Use snprintf() or scnprintf() in order to avoid
+ * buffer overflows.
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
+ */
+int sprintf(char *buf, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i = vsnprintf(buf, INT_MAX, fmt, args);
+ va_end(args);
+
+ return i;
+}
+EXPORT_SYMBOL(sprintf);
+
+#ifdef CONFIG_BINARY_PRINTF
+/*
+ * bprintf service:
+ * vbin_printf() - VA arguments to binary data
+ * bstr_printf() - Binary data to text string
+ */
+
+/**
+ * vbin_printf - Parse a format string and place args' binary value in a buffer
+ * @bin_buf: The buffer to place args' binary value
+ * @size: The size of the buffer(by words(32bits), not characters)
+ * @fmt: The format string to use
+ * @args: Arguments for the format string
+ *
+ * The format follows C99 vsnprintf, except %n is ignored, and its argument
+ * is skiped.
+ *
+ * The return value is the number of words(32bits) which would be generated for
+ * the given input.
+ *
+ * NOTE:
+ * If the return value is greater than @size, the resulting bin_buf is NOT
+ * valid for bstr_printf().
+ */
+int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
+{
+ struct printf_spec spec = {0};
+ char *str, *end;
+
+ str = (char *)bin_buf;
+ end = (char *)(bin_buf + size);
+
+#define save_arg(type) \
+do { \
+ if (sizeof(type) == 8) { \
+ unsigned long long value; \
+ str = PTR_ALIGN(str, sizeof(u32)); \
+ value = va_arg(args, unsigned long long); \
+ if (str + sizeof(type) <= end) { \
+ *(u32 *)str = *(u32 *)&value; \
+ *(u32 *)(str + 4) = *((u32 *)&value + 1); \
+ } \
+ } else { \
+ unsigned long value; \
+ str = PTR_ALIGN(str, sizeof(type)); \
+ value = va_arg(args, int); \
+ if (str + sizeof(type) <= end) \
+ *(typeof(type) *)str = (type)value; \
+ } \
+ str += sizeof(type); \
+} while (0)
+
+ while (*fmt) {
+ int read = format_decode(fmt, &spec);
+
+ fmt += read;
+
+ switch (spec.type) {
+ case FORMAT_TYPE_NONE:
+ case FORMAT_TYPE_INVALID:
+ case FORMAT_TYPE_PERCENT_CHAR:
+ break;
+
+ case FORMAT_TYPE_WIDTH:
+ case FORMAT_TYPE_PRECISION:
+ save_arg(int);
+ break;
+
+ case FORMAT_TYPE_CHAR:
+ save_arg(char);
+ break;
+
+ case FORMAT_TYPE_STR: {
+ const char *save_str = va_arg(args, char *);
+ size_t len;
+
+ if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
+ || (unsigned long)save_str < PAGE_SIZE)
+ save_str = "(null)";
+ len = strlen(save_str) + 1;
+ if (str + len < end)
+ memcpy(str, save_str, len);
+ str += len;
+ break;
+ }
+
+ case FORMAT_TYPE_PTR:
+ save_arg(void *);
+ /* skip all alphanumeric pointer suffixes */
+ while (isalnum(*fmt))
+ fmt++;
+ break;
+
+ case FORMAT_TYPE_NRCHARS: {
+ /* skip %n 's argument */
+ u8 qualifier = spec.qualifier;
+ void *skip_arg;
+ if (qualifier == 'l')
+ skip_arg = va_arg(args, long *);
+ else if (_tolower(qualifier) == 'z')
+ skip_arg = va_arg(args, size_t *);
+ else
+ skip_arg = va_arg(args, int *);
+ break;
+ }
+
+ default:
+ switch (spec.type) {
+
+ case FORMAT_TYPE_LONG_LONG:
+ save_arg(long long);
+ break;
+ case FORMAT_TYPE_ULONG:
+ case FORMAT_TYPE_LONG:
+ save_arg(unsigned long);
+ break;
+ case FORMAT_TYPE_SIZE_T:
+ save_arg(size_t);
+ break;
+ case FORMAT_TYPE_PTRDIFF:
+ save_arg(ptrdiff_t);
+ break;
+ case FORMAT_TYPE_UBYTE:
+ case FORMAT_TYPE_BYTE:
+ save_arg(char);
+ break;
+ case FORMAT_TYPE_USHORT:
+ case FORMAT_TYPE_SHORT:
+ save_arg(short);
+ break;
+ default:
+ save_arg(int);
+ }
+ }
+ }
+
+ return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
+#undef save_arg
+}
+EXPORT_SYMBOL_GPL(vbin_printf);
+
+/**
+ * bstr_printf - Format a string from binary arguments and place it in a buffer
+ * @buf: The buffer to place the result into
+ * @size: The size of the buffer, including the trailing null space
+ * @fmt: The format string to use
+ * @bin_buf: Binary arguments for the format string
+ *
+ * This function like C99 vsnprintf, but the difference is that vsnprintf gets
+ * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
+ * a binary buffer that generated by vbin_printf.
+ *
+ * The format follows C99 vsnprintf, but has some extensions:
+ * see vsnprintf comment for details.
+ *
+ * The return value is the number of characters which would
+ * be generated for the given input, excluding the trailing
+ * '\0', as per ISO C99. If you want to have the exact
+ * number of characters written into @buf as return value
+ * (not including the trailing '\0'), use vscnprintf(). If the
+ * return is greater than or equal to @size, the resulting
+ * string is truncated.
+ */
+int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
+{
+ struct printf_spec spec = {0};
+ char *str, *end;
+ const char *args = (const char *)bin_buf;
+
+ if (WARN_ON_ONCE((int) size < 0))
+ return 0;
+
+ str = buf;
+ end = buf + size;
+
+#define get_arg(type) \
+({ \
+ typeof(type) value; \
+ if (sizeof(type) == 8) { \
+ args = PTR_ALIGN(args, sizeof(u32)); \
+ *(u32 *)&value = *(u32 *)args; \
+ *((u32 *)&value + 1) = *(u32 *)(args + 4); \
+ } else { \
+ args = PTR_ALIGN(args, sizeof(type)); \
+ value = *(typeof(type) *)args; \
+ } \
+ args += sizeof(type); \
+ value; \
+})
+
+ /* Make sure end is always >= buf */
+ if (end < buf) {
+ end = ((void *)-1);
+ size = end - buf;
+ }
+
+ while (*fmt) {
+ const char *old_fmt = fmt;
+ int read = format_decode(fmt, &spec);
+
+ fmt += read;
+
+ switch (spec.type) {
+ case FORMAT_TYPE_NONE: {
+ int copy = read;
+ if (str < end) {
+ if (copy > end - str)
+ copy = end - str;
+ memcpy(str, old_fmt, copy);
+ }
+ str += read;
+ break;
+ }
+
+ case FORMAT_TYPE_WIDTH:
+ spec.field_width = get_arg(int);
+ break;
+
+ case FORMAT_TYPE_PRECISION:
+ spec.precision = get_arg(int);
+ break;
+
+ case FORMAT_TYPE_CHAR: {
+ char c;
+
+ if (!(spec.flags & LEFT)) {
+ while (--spec.field_width > 0) {
+ if (str < end)
+ *str = ' ';
+ ++str;
+ }
+ }
+ c = (unsigned char) get_arg(char);
+ if (str < end)
+ *str = c;
+ ++str;
+ while (--spec.field_width > 0) {
+ if (str < end)
+ *str = ' ';
+ ++str;
+ }
+ break;
+ }
+
+ case FORMAT_TYPE_STR: {
+ const char *str_arg = args;
+ args += strlen(str_arg) + 1;
+ str = string(str, end, (char *)str_arg, spec);
+ break;
+ }
+
+ case FORMAT_TYPE_PTR:
+ str = pointer(fmt+1, str, end, get_arg(void *), spec);
+ while (isalnum(*fmt))
+ fmt++;
+ break;
+
+ case FORMAT_TYPE_PERCENT_CHAR:
+ case FORMAT_TYPE_INVALID:
+ if (str < end)
+ *str = '%';
+ ++str;
+ break;
+
+ case FORMAT_TYPE_NRCHARS:
+ /* skip */
+ break;
+
+ default: {
+ unsigned long long num;
+
+ switch (spec.type) {
+
+ case FORMAT_TYPE_LONG_LONG:
+ num = get_arg(long long);
+ break;
+ case FORMAT_TYPE_ULONG:
+ case FORMAT_TYPE_LONG:
+ num = get_arg(unsigned long);
+ break;
+ case FORMAT_TYPE_SIZE_T:
+ num = get_arg(size_t);
+ break;
+ case FORMAT_TYPE_PTRDIFF:
+ num = get_arg(ptrdiff_t);
+ break;
+ case FORMAT_TYPE_UBYTE:
+ num = get_arg(unsigned char);
+ break;
+ case FORMAT_TYPE_BYTE:
+ num = get_arg(signed char);
+ break;
+ case FORMAT_TYPE_USHORT:
+ num = get_arg(unsigned short);
+ break;
+ case FORMAT_TYPE_SHORT:
+ num = get_arg(short);
+ break;
+ case FORMAT_TYPE_UINT:
+ num = get_arg(unsigned int);
+ break;
+ default:
+ num = get_arg(int);
+ }
+
+ str = number(str, end, num, spec);
+ } /* default: */
+ } /* switch(spec.type) */
+ } /* while(*fmt) */
+
+ if (size > 0) {
+ if (str < end)
+ *str = '\0';
+ else
+ end[-1] = '\0';
+ }
+
+#undef get_arg
+
+ /* the trailing null byte doesn't count towards the total */
+ return str - buf;
+}
+EXPORT_SYMBOL_GPL(bstr_printf);
+
+/**
+ * bprintf - Parse a format string and place args' binary value in a buffer
+ * @bin_buf: The buffer to place args' binary value
+ * @size: The size of the buffer(by words(32bits), not characters)
+ * @fmt: The format string to use
+ * @...: Arguments for the format string
+ *
+ * The function returns the number of words(u32) written
+ * into @bin_buf.
+ */
+int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
+{
+ va_list args;
+ int ret;
+
+ va_start(args, fmt);
+ ret = vbin_printf(bin_buf, size, fmt, args);
+ va_end(args);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(bprintf);
+
+#endif /* CONFIG_BINARY_PRINTF */
+
+/**
+ * vsscanf - Unformat a buffer into a list of arguments
+ * @buf: input buffer
+ * @fmt: format of buffer
+ * @args: arguments
+ */
+int vsscanf(const char *buf, const char *fmt, va_list args)
+{
+ const char *str = buf;
+ char *next;
+ char digit;
+ int num = 0;
+ u8 qualifier;
+ u8 base;
+ s16 field_width;
+ bool is_sign;
+
+ while (*fmt && *str) {
+ /* skip any white space in format */
+ /* white space in format matchs any amount of
+ * white space, including none, in the input.
+ */
+ if (isspace(*fmt)) {
+ fmt = skip_spaces(++fmt);
+ str = skip_spaces(str);
+ }
+
+ /* anything that is not a conversion must match exactly */
+ if (*fmt != '%' && *fmt) {
+ if (*fmt++ != *str++)
+ break;
+ continue;
+ }
+
+ if (!*fmt)
+ break;
+ ++fmt;
+
+ /* skip this conversion.
+ * advance both strings to next white space
+ */
+ if (*fmt == '*') {
+ while (!isspace(*fmt) && *fmt != '%' && *fmt)
+ fmt++;
+ while (!isspace(*str) && *str)
+ str++;
+ continue;
+ }
+
+ /* get field width */
+ field_width = -1;
+ if (isdigit(*fmt))
+ field_width = skip_atoi(&fmt);
+
+ /* get conversion qualifier */
+ qualifier = -1;
+ if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
+ _tolower(*fmt) == 'z') {
+ qualifier = *fmt++;
+ if (unlikely(qualifier == *fmt)) {
+ if (qualifier == 'h') {
+ qualifier = 'H';
+ fmt++;
+ } else if (qualifier == 'l') {
+ qualifier = 'L';
+ fmt++;
+ }
+ }
+ }
+
+ if (!*fmt || !*str)
+ break;
+
+ base = 10;
+ is_sign = 0;
+
+ switch (*fmt++) {
+ case 'c':
+ {
+ char *s = (char *)va_arg(args, char*);
+ if (field_width == -1)
+ field_width = 1;
+ do {
+ *s++ = *str++;
+ } while (--field_width > 0 && *str);
+ num++;
+ }
+ continue;
+ case 's':
+ {
+ char *s = (char *)va_arg(args, char *);
+ if (field_width == -1)
+ field_width = SHRT_MAX;
+ /* first, skip leading white space in buffer */
+ str = skip_spaces(str);
+
+ /* now copy until next white space */
+ while (*str && !isspace(*str) && field_width--)
+ *s++ = *str++;
+ *s = '\0';
+ num++;
+ }
+ continue;
+ case 'n':
+ /* return number of characters read so far */
+ {
+ int *i = (int *)va_arg(args, int*);
+ *i = str - buf;
+ }
+ continue;
+ case 'o':
+ base = 8;
+ break;
+ case 'x':
+ case 'X':
+ base = 16;
+ break;
+ case 'i':
+ base = 0;
+ case 'd':
+ is_sign = 1;
+ case 'u':
+ break;
+ case '%':
+ /* looking for '%' in str */
+ if (*str++ != '%')
+ return num;
+ continue;
+ default:
+ /* invalid format; stop here */
+ return num;
+ }
+
+ /* have some sort of integer conversion.
+ * first, skip white space in buffer.
+ */
+ str = skip_spaces(str);
+
+ digit = *str;
+ if (is_sign && digit == '-')
+ digit = *(str + 1);
+
+ if (!digit
+ || (base == 16 && !isxdigit(digit))
+ || (base == 10 && !isdigit(digit))
+ || (base == 8 && (!isdigit(digit) || digit > '7'))
+ || (base == 0 && !isdigit(digit)))
+ break;
+
+ switch (qualifier) {
+ case 'H': /* that's 'hh' in format */
+ if (is_sign) {
+ signed char *s = (signed char *)va_arg(args, signed char *);
+ *s = (signed char)simple_strtol(str, &next, base);
+ } else {
+ unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
+ *s = (unsigned char)simple_strtoul(str, &next, base);
+ }
+ break;
+ case 'h':
+ if (is_sign) {
+ short *s = (short *)va_arg(args, short *);
+ *s = (short)simple_strtol(str, &next, base);
+ } else {
+ unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
+ *s = (unsigned short)simple_strtoul(str, &next, base);
+ }
+ break;
+ case 'l':
+ if (is_sign) {
+ long *l = (long *)va_arg(args, long *);
+ *l = simple_strtol(str, &next, base);
+ } else {
+ unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
+ *l = simple_strtoul(str, &next, base);
+ }
+ break;
+ case 'L':
+ if (is_sign) {
+ long long *l = (long long *)va_arg(args, long long *);
+ *l = simple_strtoll(str, &next, base);
+ } else {
+ unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
+ *l = simple_strtoull(str, &next, base);
+ }
+ break;
+ case 'Z':
+ case 'z':
+ {
+ size_t *s = (size_t *)va_arg(args, size_t *);
+ *s = (size_t)simple_strtoul(str, &next, base);
+ }
+ break;
+ default:
+ if (is_sign) {
+ int *i = (int *)va_arg(args, int *);
+ *i = (int)simple_strtol(str, &next, base);
+ } else {
+ unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
+ *i = (unsigned int)simple_strtoul(str, &next, base);
+ }
+ break;
+ }
+ num++;
+
+ if (!next)
+ break;
+ str = next;
+ }
+
+ /*
+ * Now we've come all the way through so either the input string or the
+ * format ended. In the former case, there can be a %n at the current
+ * position in the format that needs to be filled.
+ */
+ if (*fmt == '%' && *(fmt + 1) == 'n') {
+ int *p = (int *)va_arg(args, int *);
+ *p = str - buf;
+ }
+
+ return num;
+}
+EXPORT_SYMBOL(vsscanf);
+
+/**
+ * sscanf - Unformat a buffer into a list of arguments
+ * @buf: input buffer
+ * @fmt: formatting of buffer
+ * @...: resulting arguments
+ */
+int sscanf(const char *buf, const char *fmt, ...)
+{
+ va_list args;
+ int i;
+
+ va_start(args, fmt);
+ i = vsscanf(buf, fmt, args);
+ va_end(args);
+
+ return i;
+}
+EXPORT_SYMBOL(sscanf);