projects/pwm

view compat/getline.c @ 26:5bdea77d0c1d

Add pwm-clip utility for setting the X11 CLIPBOARD selection
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Thu Sep 21 09:45:59 2017 +0200 (2017-09-21)
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1 /*
2 * Copyright (C) 2016 Guido Berhoerster <guido+pwm@berhoerster.name>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included
13 * in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <limits.h>
27 #include <sys/types.h>
28 #include <errno.h>
30 #include "getline.h"
32 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
34 ssize_t
35 getdelim(char **linep, size_t *sizep, int delim, FILE *fp)
36 {
37 ssize_t len;
38 char *line = *linep;
39 size_t size = *sizep;
40 size_t pos = 0;
41 char *line_new;
42 int c;
44 if (*linep == NULL) {
45 size = 0;
46 }
48 flockfile(fp);
50 for (;;) {
51 if (size - pos < 2) {
52 size = MIN((size_t)SSIZE_MAX + 1,
53 (size < BUFSIZ) ? BUFSIZ : size * 1.5);
54 if (size - pos < 2) {
55 len = -1;
56 errno = EOVERFLOW;
57 break;
58 }
59 line_new = realloc(line, size);
60 if (line_new == NULL) {
61 len = -1;
62 break;
63 }
64 *linep = line = line_new;
65 *sizep = size;
66 }
67 c = fgetc(fp);
68 if (c == EOF) {
69 len = -1;
70 break;
71 }
72 line[pos] = c;
73 pos++;
74 len = pos;
75 if (c == delim) {
76 break;
77 }
78 }
80 if (*linep != NULL) {
81 (*linep)[pos] = '\0';
82 }
84 funlockfile(fp);
86 return (len);
87 }
89 ssize_t
90 getline(char **linep, size_t *sizep, FILE *fp)
91 {
92 return (getdelim(linep, sizep, '\n', fp));
93 }