[String]stripslashes함수의 구현

[String]stripslashes함수의 구현
stripslashes : addslashes로 quoted된 문자열을 unquoted한다.

gcc ver: 2.95.4
os: linux
ref: php-4.3.0
compile: gcc -o test test.c
require memory free: yes

[code]
#include <stdio.h>
#include <malloc.h>

int stripslashes(char *,char **,int *);

int main(int argc,char **argv){

        char *tt="This is sample\\'\\\\\\\"\\\\";
        char *ret;

        stripslashes(tt,&ret,NULL);

        printf("%s %d\n",tt,strlen(tt));

        printf("%s %d\n",ret,strlen(ret));

        free(ret);

        return 0;

}

int stripslashes(char *str,char **ret,int *len){

    char *s,*t;
    int l;
    int str_len=0;

    str_len=strlen(str);

    if(((*ret)=(char *)malloc(sizeof(char)*str_len+1))==NULL) return 1;
    memset((*ret),0x0,sizeof(char)*str_len+1);
    memmove((*ret),str,str_len);

    if(len!=NULL){

        l=*len;

    }else{

        l=str_len;

    }

    s=(*ret);
    t=(*ret);

    while(l>0){

        if(*t=='\\'){

            t++;                /* skip the slash */

            if(len!=NULL){

                (*len)--;

            }

            l--;

            if(l>0){

                if(*t=='0'){

                    *s++='\0';
                    t++;

                }else{

                    *s++=*t++;    /* preserve the next character */

                }

                l--;

            }

        }else{

            if(s!=t){

                *s++ = *t++;

            }else{

                s++;
                t++;

            }

            l--;

        }

    }

    if(s!=t){

        *s='\0';

    }

    return 0;

}
[/code]