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46 lines
736 B
46 lines
736 B
/*
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** 字符串的操作
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*/
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#include "avformat.h"
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/*
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** 在 str 字符串中搜索 val 字符串指示的头，并且去掉头后用*ptr 返回
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*/
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int strstart(const char *str, const char *val, const char **ptr)
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{
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const char *p, *q;
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p = str;
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q = val;
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while (*q != '\0')
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{
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if (*p != *q)
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return 0;
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p++;
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q++;
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}
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if (ptr)
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*ptr = p;
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return 1;
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}
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/*
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** 字符串拷贝函数
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*/
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void pstrcpy(char *buf, int buf_size, const char *str)
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{
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int c;
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char *q = buf;
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if (buf_size <= 0)
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return ;
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for (;;)
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{
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c = *str++;
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if (c == 0 || q >= buf + buf_size - 1)
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break;
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*q++ = c;
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}
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*q = '\0';
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}
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