httpquery.c

00001 #include <stdio.h>
00002 #include <stdlib.h>
00003 
00004 static int hexToInt(char c)
00005 {
00006     int nibble;
00007     if (c >= '0' && c <= '9') nibble = c - '0';
00008     if (c >= 'A' && c <= 'F') nibble = c - 'A' + 0xA;
00009     if (c >= 'a' && c <= 'f') nibble = c - 'a' + 0xA;
00010     return nibble;
00011 }
00012 void HttpQueryUnencode(char* pValue)
00013 {
00014     if (!pValue) return;
00015     char* pDst = pValue;
00016     int a;
00017     for (char* pSrc = pValue; *pSrc; pSrc++)
00018     {
00019         char c = *pSrc;
00020         switch (c)
00021         {
00022             case '+':
00023                 c = ' ';
00024                 break;
00025             case '%':
00026                 c = *++pSrc;
00027                 if (c == 0) break;
00028                 a = hexToInt(c);
00029                 a <<= 4;
00030                 c = *++pSrc;
00031                 if (c == 0) break;
00032                 a += hexToInt(c);
00033                 c = a;
00034                 break;
00035             default:
00036                 c = *pSrc;
00037                 break;
00038         }
00039         *pDst++ = c;
00040     }
00041     *pDst = 0;
00042 }
00043 char* HttpQuerySplit(char* p, char** ppName, char** ppValue) //returns the start of the next name value pair
00044 {    
00045     *ppName    = p;                     //Record the start of the name
00046     *ppValue   = NULL;
00047 
00048     while (*p != '=')                   //Loop to an '='
00049     {
00050         if (*p == 0)    return 0;
00051         p++;
00052     }
00053     *p = 0;                             //Terminate the name by replacing the '=' with a NUL char
00054     p++;                                //Move on to the start of the value
00055     *ppValue = p;                       //Record the start of the value
00056     while (*p != '&')                   //Loop to a '&'
00057     {
00058         if (*p == 0)    return 0;
00059         p++;
00060     }
00061     *p = 0;                            //Terminate the value by replacing the '&' with a NULL
00062     return p + 1;
00063 }
00064 int HttpQueryValueAsInt(char* pValue)
00065 {
00066     if (pValue) return (int)strtol(pValue, NULL, 10);
00067     return 0;
00068 }
00069 double HttpQueryValueAsDouble(char* pValue)
00070 {
00071     return strtod(pValue, NULL);
00072 }
00073 char* HttpCookiesSplit(char* p, char** ppName, char** ppValue) //returns the start of the next name value pair
00074 {    
00075     *ppValue   = NULL;
00076     *ppName    = NULL;
00077 
00078     *ppName    = p;                     //Record the start of the name
00079     while (*p != '=')                   //Loop to an '='
00080     {
00081         if (*p == 0) return 0;
00082         p++;
00083     }
00084     *p = 0;                             //Terminate the name by replacing the '=' with a NUL char
00085     p++;                                //Move on to the start of the value
00086     *ppValue = p;                       //Record the start of the value
00087     while (*p != ';')                   //Loop to a ';'
00088     {
00089         if (*p == 0) return 0;
00090         p++;
00091     }
00092     *p = 0;                            //Terminate the value by replacing the ';' with a NULL
00093     p++;
00094     if (*p == 0)     return 0;
00095     while (*p == ' ') p++;             //Move past any spaces after the ';'
00096     return p;
00097 }