add a simple fork test
[qemu/linux-user.git] / cutils.c
blob9617e083c6434e0b2bccef3d8a6493ee68a13818
1 /*
2 * Simple C functions to supplement the C library
4 * Copyright (c) 2006 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
24 #include "qemu-common.h"
25 #include "host-utils.h"
27 void pstrcpy(char *buf, int buf_size, const char *str)
29 int c;
30 char *q = buf;
32 if (buf_size <= 0)
33 return;
35 for(;;) {
36 c = *str++;
37 if (c == 0 || q >= buf + buf_size - 1)
38 break;
39 *q++ = c;
41 *q = '\0';
44 /* strcat and truncate. */
45 char *pstrcat(char *buf, int buf_size, const char *s)
47 int len;
48 len = strlen(buf);
49 if (len < buf_size)
50 pstrcpy(buf + len, buf_size - len, s);
51 return buf;
54 int strstart(const char *str, const char *val, const char **ptr)
56 const char *p, *q;
57 p = str;
58 q = val;
59 while (*q != '\0') {
60 if (*p != *q)
61 return 0;
62 p++;
63 q++;
65 if (ptr)
66 *ptr = p;
67 return 1;
70 int stristart(const char *str, const char *val, const char **ptr)
72 const char *p, *q;
73 p = str;
74 q = val;
75 while (*q != '\0') {
76 if (qemu_toupper(*p) != qemu_toupper(*q))
77 return 0;
78 p++;
79 q++;
81 if (ptr)
82 *ptr = p;
83 return 1;
86 time_t mktimegm(struct tm *tm)
88 time_t t;
89 int y = tm->tm_year + 1900, m = tm->tm_mon + 1, d = tm->tm_mday;
90 if (m < 3) {
91 m += 12;
92 y--;
94 t = 86400 * (d + (153 * m - 457) / 5 + 365 * y + y / 4 - y / 100 +
95 y / 400 - 719469);
96 t += 3600 * tm->tm_hour + 60 * tm->tm_min + tm->tm_sec;
97 return t;
100 int qemu_fls(int i)
102 return 32 - clz32(i);