http_unescape

SFL
Version 2.11

`http_unescape`

#include "sflhttp.h"
char *
http_unescape (
    char *string,
    char *result)

Synopsis

Removes HTTP escaping from a string. See http escape() for details of the escaping algorithm. If the result string is NULL, modifies the source string in place, else fills-in the result string. Returns the resulting string. End-of-line sequences (%0A%0D) are stored as a single new-line character, i.e. carriage-returns (%0D) are not stored.

Source Code - (sflhttp.c)

{
    char
        *target;                        /*  Where we store the result        */

    ASSERT (string);
    if (!result)                        /*  If result string is null,        */
        result = string;                /*    modify in place                */
    target = result;

    while (*string)
      {
        if (*string == '%'              /*  Unescape %xx sequence            */
        &&   string [1] && string [2])
          {
            string++;
            *target = decode_hex ((const char **) &string, 2);
            if (*target != '\r')
                target++;               /*  We do not store CRs              */
          }
        else
          {
            if (*string == '+')         /*  Spaces are escaped as '+'        */
                *target++ = ' ';
            else
                *target++ = *string;    /*  Otherwise just copy              */

            string++;
          }
      }
    *target = '\0';                     /*  Terminate target string          */
    return (result);
}

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