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str_replace字符串替换

2024-07-02 02:25:56   228人阅读

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

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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

 


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