source: azure_iot_hub/trunk/musl-1.1.18/src/string/strspn.c@ 388

Last change on this file since 388 was 388, checked in by coas-nagasima, 5 years ago

Azure IoT Hub Device C SDK を使ったサンプルの追加
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
  • Property svn:mime-type set to text/x-csrc
File size: 452 bytes
Line 
1#include <string.h>
2
3#define BITOP(a,b,op) \
4 ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
5
6size_t strspn(const char *s, const char *c)
7{
8 const char *a = s;
9 size_t byteset[32/sizeof(size_t)] = { 0 };
10
11 if (!c[0]) return 0;
12 if (!c[1]) {
13 for (; *s == *c; s++);
14 return s-a;
15 }
16
17 for (; *c && BITOP(byteset, *(unsigned char *)c, |=); c++);
18 for (; *s && BITOP(byteset, *(unsigned char *)s, &); s++);
19 return s-a;
20}
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