str_replace字符串替换

字符串替换， src 源字符串， buf_size 缓冲大小， search搜索的字符串大小， repstr 需要替换成的字符串

int str_replace(char *src, unsigned int buf_size, char* search, char *repstr)
{
if(!src ||  !search || !repstr|| buf_size < 0)
{
return -1;
}

const unsigned int size = buf_size + 1024 ;

char * temp = (char *)malloc(size);
memset(temp, 0x00, size);

char * src_pos = src;
char * result = src;
char * dst_pos = temp;

unsigned int length = 0;

int search_len = strlen(search);
int rep_len = strlen(repstr);

do
{
src_pos = strstr(src_pos, search);

if(!src_pos)
{
strcpy(dst_pos, result);
length += search_len;
break;
}

strncpy(dst_pos, result, src_pos - result);
dst_pos += src_pos - result;

//replace
strcat(dst_pos, repstr);
dst_pos += rep_len;
length +=  src_pos - result + rep_len;

src_pos += search_len;
result = src_pos;
}
while(src_pos);

if(length >= buf_size)
{
free(temp);
temp = NULL;

return -1;
}
else
{
_snprintf_c(src,buf_size,"%s", temp);
free(temp);
temp = NULL;

return 0;
}
}

int main(void)
{

char buf[512] ={"123%4235%%6723"};
printf("%s\n", buf);
str_replace(buf,512,"%","love");
printf("%s\n", buf);

return 0;
}

结果输出：

123%4235%%6723
123love4235lovelove6723