18 February 2011

httputil: my c library for http utilities

Hello every body,
Salamo Alaykom Wa rahmat Allah,

In a previous post, I wrote about my string util.. now I'll take about my http util..
It contains just one function, `get_parameter`, get parameter value from `getenv("QUERY_STRING")` env variable (to be used within CGI)..

here's the lib:

#ifndef _HTTP_UTIL_
#define _HTTP_UTIL_

static char ***out;

/**
 * get parameter value from the QUERY_STRING
 * return NULL if QUERY_STRING is null or the key has no associated value or if key found but without a value
 * returns pointer to char that you should free after use.
 */
char* get_parameter(char*);

#endif


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "stringutil.h"

static char ***out;

/**
 * get parameter value from the QUERY_STRING
 * return NULL if QUERY_STRING is null or the key has no associated value or if key found but without a value
 */
char* get_parameter(char* key)
{
    char *querystr = getenv("QUERY_STRING");
    if (querystr == NULL)
        return (void*)0;
    
    char s[strlen(querystr)] ;
    strcpy(s, querystr);
    const char delim = '&';
    const char delim2 = '=';
    static size_t size = 0;
    if (out == 0)
    {
        out = malloc(sizeof(char));
        size = split(s, &delim, out);
    }
    
    int i=0;
    for (; i<size; i++)
    {
        char* seg = (*out)[i];
        if (seg != NULL)
        {
            char ***iout = malloc(sizeof(char));
            int isize = split(seg, &delim2, iout);
            if (isize > 1 && ((*iout)[1]) != NULL && strcmp(key, (*iout)[0]) == 0)
            {
                size_t _size = strlen((*iout)[1]);
                char* value = (char*) malloc(_size*sizeof(char));
                strcpy(value, (*iout)[1]);
                free(iout);
                return value;
            }
        }
    }
    return (void*) 0;
}


This library uses the stringutil library
You can convert this library into a static lib on linux.. follow this post
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