lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org> |
| 2 | * |
| 3 | * GNU Library General Public License (LGPL) version 2 or later. |
| 4 | * |
| 5 | * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details. |
| 6 | */ |
| 7 | |
| 8 | #include "_stdio.h" |
| 9 | |
| 10 | |
| 11 | #ifdef __DO_UNLOCKED |
| 12 | |
| 13 | |
| 14 | size_t fread_unlocked(void * __restrict ptr, size_t size, size_t nmemb, |
| 15 | FILE * __restrict stream) |
| 16 | { |
| 17 | __STDIO_STREAM_VALIDATE(stream); |
| 18 | assert(stream->__filedes >= -1); |
| 19 | |
| 20 | /* Note: If nmbem * size > SIZE_MAX then there is an application |
| 21 | * bug since no array can be larger than SIZE_MAX in size. */ |
| 22 | |
| 23 | if ((__STDIO_STREAM_IS_NARROW_READING(stream) |
| 24 | || !__STDIO_STREAM_TRANS_TO_READ(stream, __FLAG_NARROW)) |
| 25 | && size && nmemb |
| 26 | ) { |
| 27 | |
| 28 | if (nmemb <= (SIZE_MAX / size)) { |
| 29 | unsigned char *buffer = (unsigned char *) ptr; |
| 30 | size_t todo, bytes, avail; |
| 31 | |
| 32 | todo = bytes = size * nmemb; |
| 33 | |
| 34 | /* Check for ungots... */ |
| 35 | while (stream->__modeflags & __FLAG_UNGOT) { |
| 36 | *buffer++ = stream->__ungot[(stream->__modeflags--) & 1]; |
| 37 | stream->__ungot[1] = 0; |
| 38 | if (!--todo) { |
| 39 | goto DONE; |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | #ifdef __STDIO_BUFFERS |
| 44 | /* Next check for available buffered... */ |
| 45 | if ((avail = stream->__bufread - stream->__bufpos) > 0) { |
| 46 | if (avail > todo) { |
| 47 | avail = todo; |
| 48 | } |
| 49 | memcpy(buffer, stream->__bufpos, avail); |
| 50 | buffer += avail; |
| 51 | stream->__bufpos += avail; |
| 52 | if (!(todo -= avail)) { |
| 53 | goto DONE; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /* We need to read from the host environment, so we must |
| 58 | * flush all line buffered streams if the stream is not |
| 59 | * fully buffered. */ |
| 60 | if (!__STDIO_STREAM_IS_FBF(stream)) { |
| 61 | __STDIO_FLUSH_LBF_STREAMS; |
| 62 | } |
| 63 | #endif |
| 64 | |
| 65 | #ifdef __UCLIBC_MJN3_ONLY__ |
| 66 | #warning CONSIDER: should we refill and read from the buffer sometimes? |
| 67 | #endif |
| 68 | while ((avail = __stdio_READ(stream, buffer, todo)) > 0) { |
| 69 | buffer += avail; |
| 70 | if (!(todo -= avail)) { |
| 71 | break; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | DONE: |
| 76 | __STDIO_STREAM_VALIDATE(stream); |
| 77 | return (bytes - todo) / size; |
| 78 | } |
| 79 | |
| 80 | __STDIO_STREAM_SET_ERROR(stream); |
| 81 | __set_errno(EINVAL); |
| 82 | } |
| 83 | |
| 84 | __STDIO_STREAM_VALIDATE(stream); |
| 85 | return 0; |
| 86 | } |
| 87 | libc_hidden_def(fread_unlocked) |
| 88 | |
| 89 | #ifndef __UCLIBC_HAS_THREADS__ |
| 90 | strong_alias(fread_unlocked,fread) |
| 91 | libc_hidden_def(fread) |
| 92 | #endif |
| 93 | |
| 94 | #elif defined __UCLIBC_HAS_THREADS__ |
| 95 | |
| 96 | size_t fread(void * __restrict ptr, size_t size, size_t nmemb, |
| 97 | register FILE * __restrict stream) |
| 98 | { |
| 99 | size_t retval; |
| 100 | __STDIO_AUTO_THREADLOCK_VAR; |
| 101 | |
| 102 | __STDIO_AUTO_THREADLOCK(stream); |
| 103 | |
| 104 | retval = fread_unlocked(ptr, size, nmemb, stream); |
| 105 | |
| 106 | __STDIO_AUTO_THREADUNLOCK(stream); |
| 107 | |
| 108 | return retval; |
| 109 | } |
| 110 | libc_hidden_def(fread) |
| 111 | |
| 112 | #endif |