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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 tarball for details.
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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 | /* 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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16 | char *xmalloc_fgets_str(FILE *file, const char *terminating_string)
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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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34 | linebufsz += 200;
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35 | linebuf = xrealloc(linebuf, linebufsz);
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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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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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46 | idx -= term_length;
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47 | break;
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48 | }
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49 | }
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50 | linebuf = xrealloc(linebuf, idx + 1);
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51 | linebuf[idx] = '\0';
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52 | return linebuf;
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53 | }
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