[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/miscutils/man.c b/ap/app/busybox/src/miscutils/man.c
new file mode 100644
index 0000000..e380fda
--- /dev/null
+++ b/ap/app/busybox/src/miscutils/man.c
@@ -0,0 +1,283 @@
+/* mini man implementation for busybox
+ * Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//usage:#define man_trivial_usage
+//usage: "[-aw] [MANPAGE]..."
+//usage:#define man_full_usage "\n\n"
+//usage: "Format and display manual page\n"
+//usage: "\n -a Display all pages"
+//usage: "\n -w Show page locations"
+
+#include "libbb.h"
+
+enum {
+ OPT_a = 1, /* all */
+ OPT_w = 2, /* print path */
+};
+
+/* This is what I see on my desktop system being executed:
+
+(
+echo ".ll 12.4i"
+echo ".nr LL 12.4i"
+echo ".pl 1100i"
+gunzip -c '/usr/man/man1/bzip2.1.gz'
+echo ".\\\""
+echo ".pl \n(nlu+10"
+) | gtbl | nroff -Tlatin1 -mandoc | less
+
+*/
+
+static int show_manpage(const char *pager, char *man_filename, int man, int level);
+
+static int run_pipe(const char *pager, char *man_filename, int man, int level)
+{
+ char *cmd;
+
+ /* Prevent man page link loops */
+ if (level > 10)
+ return 0;
+
+ if (access(man_filename, R_OK) != 0)
+ return 0;
+
+ if (option_mask32 & OPT_w) {
+ puts(man_filename);
+ return 1;
+ }
+
+ if (man) { /* man page, not cat page */
+ /* Is this a link to another manpage? */
+ /* The link has the following on the first line: */
+ /* ".so another_man_page" */
+
+ struct stat sb;
+ char *line;
+ char *linkname, *p;
+
+ /* On my system:
+ * man1/genhostid.1.gz: 203 bytes - smallest real manpage
+ * man2/path_resolution.2.gz: 114 bytes - largest link
+ */
+ xstat(man_filename, &sb);
+ if (sb.st_size > 300) /* err on the safe side */
+ goto ordinary_manpage;
+
+ line = xmalloc_open_zipped_read_close(man_filename, NULL);
+ if (!line || strncmp(line, ".so ", 4) != 0) {
+ free(line);
+ goto ordinary_manpage;
+ }
+ /* Example: man2/path_resolution.2.gz contains
+ * ".so man7/path_resolution.7\n<junk>"
+ */
+ *strchrnul(line, '\n') = '\0';
+ linkname = skip_whitespace(&line[4]);
+
+ /* If link has no slashes, we just replace man page name.
+ * If link has slashes (however many), we go back *once*.
+ * ".so zzz/ggg/page.3" does NOT go back two levels. */
+ p = strrchr(man_filename, '/');
+ if (!p)
+ goto ordinary_manpage;
+ *p = '\0';
+ if (strchr(linkname, '/')) {
+ p = strrchr(man_filename, '/');
+ if (!p)
+ goto ordinary_manpage;
+ *p = '\0';
+ }
+
+ /* Links do not have .gz extensions, even if manpage
+ * is compressed */
+ man_filename = xasprintf("%s/%s", man_filename, linkname);
+ free(line);
+ /* Note: we leak "new" man_filename string as well... */
+ if (show_manpage(pager, man_filename, man, level + 1))
+ return 1;
+ /* else: show the link, it's better than nothing */
+ }
+
+ ordinary_manpage:
+ close(STDIN_FILENO);
+ open_zipped(man_filename); /* guaranteed to use fd 0 (STDIN_FILENO) */
+ /* "2>&1" is added so that nroff errors are shown in pager too.
+ * Otherwise it may show just empty screen */
+ cmd = xasprintf(
+ man ? "gtbl | nroff -Tlatin1 -mandoc 2>&1 | %s"
+ : "%s",
+ pager);
+ system(cmd);
+ free(cmd);
+ return 1;
+}
+
+/* man_filename is of the form "/dir/dir/dir/name.s" */
+static int show_manpage(const char *pager, char *man_filename, int man, int level)
+{
+#if SEAMLESS_COMPRESSION
+ /* We leak this allocation... */
+ char *filename_with_zext = xasprintf("%s.lzma", man_filename);
+ char *ext = strrchr(filename_with_zext, '.') + 1;
+#endif
+
+#if ENABLE_FEATURE_SEAMLESS_LZMA
+ if (run_pipe(pager, filename_with_zext, man, level))
+ return 1;
+#endif
+#if ENABLE_FEATURE_SEAMLESS_XZ
+ strcpy(ext, "xz");
+ if (run_pipe(pager, filename_with_zext, man, level))
+ return 1;
+#endif
+#if ENABLE_FEATURE_SEAMLESS_BZ2
+ strcpy(ext, "bz2");
+ if (run_pipe(pager, filename_with_zext, man, level))
+ return 1;
+#endif
+#if ENABLE_FEATURE_SEAMLESS_GZ
+ strcpy(ext, "gz");
+ if (run_pipe(pager, filename_with_zext, man, level))
+ return 1;
+#endif
+
+ return run_pipe(pager, man_filename, man, level);
+}
+
+int man_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int man_main(int argc UNUSED_PARAM, char **argv)
+{
+ parser_t *parser;
+ const char *pager;
+ char **man_path_list;
+ char *sec_list;
+ char *cur_path, *cur_sect;
+ int count_mp, cur_mp;
+ int opt, not_found;
+ char *token[2];
+
+ opt_complementary = "-1"; /* at least one argument */
+ opt = getopt32(argv, "+aw");
+ argv += optind;
+
+ sec_list = xstrdup("1:2:3:4:5:6:7:8:9");
+ /* Last valid man_path_list[] is [0x10] */
+ count_mp = 0;
+ man_path_list = xzalloc(0x11 * sizeof(man_path_list[0]));
+ man_path_list[0] = getenv("MANPATH");
+ if (!man_path_list[0]) /* default, may be overridden by /etc/man.conf */
+ man_path_list[0] = (char*)"/usr/man";
+ else
+ count_mp++;
+ pager = getenv("MANPAGER");
+ if (!pager) {
+ pager = getenv("PAGER");
+ if (!pager)
+ pager = "more";
+ }
+
+ /* Parse man.conf[ig] or man_db.conf */
+ /* man version 1.6f uses man.config */
+ /* man-db implementation of man uses man_db.conf */
+ parser = config_open2("/etc/man.config", fopen_for_read);
+ if (!parser)
+ parser = config_open2("/etc/man.conf", fopen_for_read);
+ if (!parser)
+ parser = config_open2("/etc/man_db.conf", fopen_for_read);
+
+ while (config_read(parser, token, 2, 0, "# \t", PARSE_NORMAL)) {
+ if (!token[1])
+ continue;
+ if (strcmp("MANDATORY_MANPATH"+10, token[0]) == 0 /* "MANPATH"? */
+ || strcmp("MANDATORY_MANPATH", token[0]) == 0
+ ) {
+ char *path = token[1];
+ while (*path) {
+ char *next_path;
+ char **path_element;
+
+ next_path = strchr(path, ':');
+ if (next_path) {
+ *next_path = '\0';
+ if (next_path++ == path) /* "::"? */
+ goto next;
+ }
+ /* Do we already have path? */
+ path_element = man_path_list;
+ while (*path_element) {
+ if (strcmp(*path_element, path) == 0)
+ goto skip;
+ path_element++;
+ }
+ man_path_list = xrealloc_vector(man_path_list, 4, count_mp);
+ man_path_list[count_mp] = xstrdup(path);
+ count_mp++;
+ /* man_path_list is NULL terminated */
+ /*man_path_list[count_mp] = NULL; - xrealloc_vector did it */
+ skip:
+ if (!next_path)
+ break;
+ next:
+ path = next_path;
+ }
+ }
+ if (strcmp("MANSECT", token[0]) == 0) {
+ free(sec_list);
+ sec_list = xstrdup(token[1]);
+ }
+ }
+ config_close(parser);
+
+ not_found = 0;
+ do { /* for each argv[] */
+ int found = 0;
+ cur_mp = 0;
+
+ if (strchr(*argv, '/')) {
+ found = show_manpage(pager, *argv, /*man:*/ 1, 0);
+ goto check_found;
+ }
+ while ((cur_path = man_path_list[cur_mp++]) != NULL) {
+ /* for each MANPATH */
+ cur_sect = sec_list;
+ do { /* for each section */
+ char *next_sect = strchrnul(cur_sect, ':');
+ int sect_len = next_sect - cur_sect;
+ char *man_filename;
+ int cat0man1 = 0;
+
+ /* Search for cat, then man page */
+ while (cat0man1 < 2) {
+ int found_here;
+ man_filename = xasprintf("%s/%s%.*s/%s.%.*s",
+ cur_path,
+ "cat\0man" + (cat0man1 * 4),
+ sect_len, cur_sect,
+ *argv,
+ sect_len, cur_sect);
+ found_here = show_manpage(pager, man_filename, cat0man1, 0);
+ found |= found_here;
+ cat0man1 += found_here + 1;
+ free(man_filename);
+ }
+
+ if (found && !(opt & OPT_a))
+ goto next_arg;
+ cur_sect = next_sect;
+ while (*cur_sect == ':')
+ cur_sect++;
+ } while (*cur_sect);
+ }
+ check_found:
+ if (!found) {
+ bb_error_msg("no manual entry for '%s'", *argv);
+ not_found = 1;
+ }
+ next_arg:
+ argv++;
+ } while (*argv);
+
+ return not_found;
+}