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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