[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) many different people.
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| 6 | * If you wrote this, please acknowledge your work.
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 9 | */
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| 10 |
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| 11 | #include "libbb.h"
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| 12 |
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| 13 | static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off, size_t *maxsz_p)
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| 14 | {
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| 15 | char *linebuf = NULL;
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| 16 | const int term_length = strlen(terminating_string);
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| 17 | int end_string_offset;
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| 18 | int linebufsz = 0;
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| 19 | int idx = 0;
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| 20 | int ch;
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| 21 | size_t maxsz = *maxsz_p;
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| 22 |
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| 23 | while (1) {
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| 24 | ch = fgetc(file);
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| 25 | if (ch == EOF) {
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| 26 | if (idx == 0)
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| 27 | return linebuf; /* NULL */
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| 28 | break;
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| 29 | }
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| 30 |
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| 31 | if (idx >= linebufsz) {
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| 32 | linebufsz += 200;
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| 33 | linebuf = xrealloc(linebuf, linebufsz);
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| 34 | if (idx >= maxsz) {
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| 35 | linebuf[idx] = ch;
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| 36 | idx++;
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| 37 | break;
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| 38 | }
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| 39 | }
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| 40 |
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| 41 | linebuf[idx] = ch;
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| 42 | idx++;
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| 43 |
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| 44 | /* Check for terminating string */
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| 45 | end_string_offset = idx - term_length;
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| 46 | if (end_string_offset >= 0
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| 47 | && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
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| 48 | ) {
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| 49 | if (chop_off)
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| 50 | idx -= term_length;
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| 51 | break;
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| 52 | }
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| 53 | }
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| 54 | /* Grow/shrink *first*, then store NUL */
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| 55 | linebuf = xrealloc(linebuf, idx + 1);
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| 56 | linebuf[idx] = '\0';
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| 57 | *maxsz_p = idx;
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| 58 | return linebuf;
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| 59 | }
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| 60 |
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| 61 | /* Read up to TERMINATING_STRING from FILE and return it,
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| 62 | * including terminating string.
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| 63 | * Non-terminated string can be returned if EOF is reached.
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| 64 | * Return NULL if EOF is reached immediately. */
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| 65 | char* FAST_FUNC xmalloc_fgets_str(FILE *file, const char *terminating_string)
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| 66 | {
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| 67 | size_t maxsz = INT_MAX - 4095;
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| 68 | return xmalloc_fgets_internal(file, terminating_string, 0, &maxsz);
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| 69 | }
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| 70 |
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| 71 | char* FAST_FUNC xmalloc_fgets_str_len(FILE *file, const char *terminating_string, size_t *maxsz_p)
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| 72 | {
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| 73 | size_t maxsz;
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| 74 |
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| 75 | if (!maxsz_p) {
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| 76 | maxsz = INT_MAX - 4095;
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| 77 | maxsz_p = &maxsz;
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| 78 | }
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| 79 | return xmalloc_fgets_internal(file, terminating_string, 0, maxsz_p);
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| 80 | }
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| 81 |
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| 82 | char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
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| 83 | {
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| 84 | size_t maxsz = INT_MAX - 4095;
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| 85 | return xmalloc_fgets_internal(file, terminating_string, 1, &maxsz);
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| 86 | }
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