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annotate compat/getline.c @ 31:9be355e742e5

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Distinguish between unknown argument and missing value
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Tue, 28 Nov 2017 16:48:45 +0100
parents 5bdea77d0c1d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (C) 2016 Guido Berhoerster <guido+pwm@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <limits.h>
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27 #include <sys/types.h>
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28 #include <errno.h>
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29
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30 #include "getline.h"
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31
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32 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
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33
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34 ssize_t
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35 getdelim(char **linep, size_t *sizep, int delim, FILE *fp)
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36 {
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37 ssize_t len;
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38 char *line = *linep;
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39 size_t size = *sizep;
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40 size_t pos = 0;
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41 char *line_new;
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42 int c;
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43
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44 if (*linep == NULL) {
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45 size = 0;
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46 }
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47
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48 flockfile(fp);
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49
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50 for (;;) {
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51 if (size - pos < 2) {
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52 size = MIN((size_t)SSIZE_MAX + 1,
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53 (size < BUFSIZ) ? BUFSIZ : size * 1.5);
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54 if (size - pos < 2) {
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55 len = -1;
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56 errno = EOVERFLOW;
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57 break;
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58 }
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59 line_new = realloc(line, size);
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60 if (line_new == NULL) {
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61 len = -1;
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62 break;
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63 }
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64 *linep = line = line_new;
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65 *sizep = size;
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66 }
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67 c = fgetc(fp);
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68 if (c == EOF) {
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69 len = -1;
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70 break;
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71 }
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72 line[pos] = c;
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73 pos++;
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74 len = pos;
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75 if (c == delim) {
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76 break;
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77 }
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78 }
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79
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80 if (*linep != NULL) {
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81 (*linep)[pos] = '\0';
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82 }
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83
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84 funlockfile(fp);
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85
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86 return (len);
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87 }
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88
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89 ssize_t
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90 getline(char **linep, size_t *sizep, FILE *fp)
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91 {
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92 return (getdelim(linep, sizep, '\n', fp));
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93 }