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#include <stdio.h>#include <assert.h>#include <stdlib.h>#include <string.h>int substr(char dst[], char src[], int start, int len)
{ assert(src != NULL && dst != NULL);
char *pdst = dst;
int lensrc = 0;
while (start--)
{
src++;
}
lensrc = strlen(src);
if (lensrc < len)
{
len = lensrc;
}
while (len--)
{
*dst++ = *src++;
}
*dst = '\0';
return strlen(pdst);
}int main()
{ char s[] = "abcdefg";
char str[20];
int ret = substr(str, s, 4, 5);
printf("%s\n", str);
printf("%d\n", ret);
system("pause");
return 0;
}
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本文转自 七十七快 51CTO博客，原文链接:http://blog.51cto.com/10324228/1686771