79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) many different people.
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* If you wrote this, please acknowledge your work.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off, size_t *maxsz_p)
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{
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char *linebuf = NULL;
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const int term_length = strlen(terminating_string);
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int end_string_offset;
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int linebufsz = 0;
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int idx = 0;
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int ch;
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size_t maxsz = maxsz_p ? *maxsz_p : INT_MAX - 4095;
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while (1) {
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ch = fgetc(file);
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if (ch == EOF) {
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if (idx == 0)
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return linebuf; /* NULL */
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break;
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}
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if (idx >= linebufsz) {
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linebufsz += 200;
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linebuf = xrealloc(linebuf, linebufsz);
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if (idx >= maxsz) {
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linebuf[idx] = ch;
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idx++;
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break;
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}
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}
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linebuf[idx] = ch;
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idx++;
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/* Check for terminating string */
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end_string_offset = idx - term_length;
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if (end_string_offset >= 0
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&& memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
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) {
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if (chop_off)
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idx -= term_length;
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break;
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}
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}
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/* Grow/shrink *first*, then store NUL */
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linebuf = xrealloc(linebuf, idx + 1);
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linebuf[idx] = '\0';
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if (maxsz_p)
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*maxsz_p = idx;
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return linebuf;
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}
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/* Read up to TERMINATING_STRING from FILE and return it,
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* including terminating string.
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* Non-terminated string can be returned if EOF is reached.
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* Return NULL if EOF is reached immediately. */
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char* FAST_FUNC xmalloc_fgets_str(FILE *file, const char *terminating_string)
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{
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return xmalloc_fgets_internal(file, terminating_string, 0, NULL);
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}
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char* FAST_FUNC xmalloc_fgets_str_len(FILE *file, const char *terminating_string, size_t *maxsz_p)
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{
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return xmalloc_fgets_internal(file, terminating_string, 0, maxsz_p);
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}
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char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
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{
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return xmalloc_fgets_internal(file, terminating_string, 1, NULL);
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}
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