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[821] | 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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[1765] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 9 | */
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| 10 |
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| 11 | #include "libbb.h"
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| 12 |
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| 13 | /* Read up to (and including) TERMINATING_STRING from FILE and return it.
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| 14 | * Return NULL on EOF. */
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| 15 |
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[1765] | 16 | char *xmalloc_fgets_str(FILE *file, const char *terminating_string)
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[821] | 17 | {
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| 18 | char *linebuf = NULL;
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| 19 | const int term_length = strlen(terminating_string);
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| 20 | int end_string_offset;
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| 21 | int linebufsz = 0;
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| 22 | int idx = 0;
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| 23 | int ch;
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| 24 |
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| 25 | while (1) {
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| 26 | ch = fgetc(file);
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| 27 | if (ch == EOF) {
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| 28 | free(linebuf);
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| 29 | return NULL;
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| 30 | }
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| 31 |
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| 32 | /* grow the line buffer as necessary */
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| 33 | while (idx > linebufsz - 2) {
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[1765] | 34 | linebufsz += 200;
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| 35 | linebuf = xrealloc(linebuf, linebufsz);
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[821] | 36 | }
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| 37 |
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| 38 | linebuf[idx] = ch;
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| 39 | idx++;
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| 40 |
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| 41 | /* Check for terminating string */
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| 42 | end_string_offset = idx - term_length;
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[1765] | 43 | if (end_string_offset > 0
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| 44 | && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
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| 45 | ) {
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[821] | 46 | idx -= term_length;
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| 47 | break;
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| 48 | }
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| 49 | }
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[1765] | 50 | linebuf = xrealloc(linebuf, idx + 1);
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[821] | 51 | linebuf[idx] = '\0';
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[1765] | 52 | return linebuf;
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[821] | 53 | }
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