#include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #define ishex(x) (((x) >= '0' && (x) <= '9') || ((x) >= 'a' && \ (x) <= 'f') || ((x) >= 'A' && (x) <= 'F')) int htoi(char *s) { int value; char c; c = s[0]; if(isupper(c)) c = tolower(c); value=(c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10) * 16; c = s[1]; if(isupper(c)) c = tolower(c); value += c >= '0' && c <= '9' ? c - '0' : c - 'a' + 10; return(value); } void main(int argc, char *argv[]) { char *params, *data, *dest, *s, *tmp; char *name, *age; puts("Content-type: text/html\r\n"); puts("<HTML><HEAD><TITLE>Form Example</TITLE></HEAD>"); puts("<BODY><H1>My Example Form</H1>"); puts("<FORM action=\"form.cgi\" method=\"GET\">"); puts("Name: <INPUT type=\"text\" name=\"name\">"); puts("Age: <INPUT type=\"text\" name=\"age\">"); puts("<BR><INPUT type=\"submit\">"); puts("</FORM>"); data = getenv("QUERY_STRING"); if(data && *data) { params = data; dest = data; while(*data) { if(*data=='+') *dest=' '; else if(*data == '%' && ishex(*(data+1))&&ishex(*(data+2))) { *dest = (char) htoi(data + 1); data+=2; } else *dest = *data; data++; dest++; } *dest = '\0'; s = strtok(params,"&"); do { tmp = strchr(s,'='); if(tmp) { *tmp = '\0'; if(!strcmp(s,"name")) name = tmp+1; else if(!strcmp(s,"age")) age = tmp+1; } } while(s=strtok(NULL,"&")); printf("Hi %s, you are %s years old\n",name,age); } puts("</BODY></HTML>"); }