C语言写CGI常用函数

来源：互联网发布：上海跳跃网络吧编辑：程序博客网时间：2024/06/06 01:58

int IntFromHex(char *pChars)
{
   int Hi;
   int Lo;
   int Result;

   Hi=pChars[0];
   if ('0'<=Hi&&Hi<='9') {
       Hi-='0';
   } else if ('a'<=Hi&&Hi<='f') {
       Hi-=('a'-10);
   } else if ('A'<=Hi&&Hi<='F') {
       Hi-=('A'-10);
   }
   Lo = pChars[1];
   if ('0'<=Lo&&Lo<='9') {
       Lo-='0';
   } else if ('a'<=Lo&&Lo<='f') {
       Lo-=('a'-10);
   } else if ('A'<=Lo&&Lo<='F') {
       Lo-=('A'-10);
   }
   Result=Lo+(16*Hi);
   return (Result);
}

void URLDecode(char *pEncoded)
{
   char *pDecoded;

   pDecoded=pEncoded;
   while (*pDecoded) {
       if (*pDecoded=='+') *pDecoded=' ';
       pDecoded++;
   };
   pDecoded=pEncoded;
   while (*pEncoded) {
       if (*pEncoded=='%') {
           pEncoded++;
           if (isxdigit(pEncoded[0])&&isxdigit(pEncoded[1])) {
               *pDecoded++=(char)IntFromHex(pEncoded);
               pEncoded+=2;
           }
       } else {
           *pDecoded++=*pEncoded++;
       }
   }
   *pDecoded='\0';
}

char *str2html(char *instring)
{
   static unsigned char buffer[8192];
   unsigned char ch;
   int blen=0;
   int i=0;

   memset(buffer, 0, sizeof(buffer));
   while ((instring[i])&&(i<sizeof(buffer)-1)) {
       ch=instring[i];
       if (ch==0) break;
       if ((ch!=10)&&(ch!=13)) {
           if (ch<32) { i++; continue; }
       }
       if (ch=='\"') {
           buffer[blen++]='&';
           buffer[blen++]='q';
           buffer[blen++]='u';
           buffer[blen++]='o';
           buffer[blen++]='t';
           buffer[blen++]=';';
           i++;
           continue;
       }
       if (ch=='&') {
           buffer[blen++]='&';
           buffer[blen++]='a';
           buffer[blen++]='m';
           buffer[blen++]='p';
           buffer[blen++]=';';
           i++;
           continue;
       }
       if (ch=='<') {
           buffer[blen++]='&';
           buffer[blen++]='l';
           buffer[blen++]='t';
           buffer[blen++]=';';
           i++;
           continue;
       }
       if (ch=='>') {
           buffer[blen++]='&';
           buffer[blen++]='g';
           buffer[blen++]='t';
           buffer[blen++]=';';
           i++;
           continue;
       }
       buffer[blen++]=ch;
       i++;
   }
   return (char *)buffer;
}

char *strcasestr(const char *src, const char *query)
{
   char *pToken;
   char Buffer[8192];
   char Query[64];
   int loop;

   if (strlen(src)==0) return NULL;
   memset(Buffer, 0, sizeof(Buffer));
   strncpy(Buffer, src, sizeof(Buffer)-1);
   strncpy(Query, query, sizeof(Query)-1);
   loop=0;
   while (Buffer[loop]) {
       Buffer[loop]=toupper(Buffer[loop]);
       loop++;
   }
   loop=0;
   while (Query[loop]) {
       Query[loop]=toupper(Query[loop]);
       loop++;
   }
   pToken=strstr(Buffer, Query);
   if (pToken!=NULL) {
       return (char *)src+(pToken-(char *)&Buffer);
   }
   return NULL;
}

void striprn(char *string)
{
   while ((string[strlen(string)-1]=='\r')||(string[strlen(string)-1]=='\n')) {
       string[strlen(string)-1]='\0';
   }
}

0 0