parseget.c

来自「HTML语言的例子」· C语言 代码 · 共 43 行

#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include "parse.h"

char *buildget(char *query, int size, char delim, int *len)
{
  register int i;
  char *gen,hex2c[2];
  int length=strlen(query);

  if(!(gen=malloc(sizeof(char)*(size+1))))
    return gen;

  for(i=0; (*len); i++){
    if(i>size+1){
      free(gen);
      return (char *)NULL;
    }
    gen[i]=query[length - *len];
    --(*len);
    if((gen[i] == delim) || (gen[i]==EOF)){
      gen[i]='\0';
      return gen;
    }
    if(gen[i]=='+')
      gen[i]=' ';
    if(gen[i]=='%'){
      hex2c[0]=query[length - *len];
      --(*len);
      hex2c[1]=query[length - *len];
      --(*len);
      gen[i] = (!(isalpha(hex2c[0])) ? (hex2c[0] - '0') :
		((hex2c[0] & 0xdf) - 'A' + 10)) << 4;
      gen[i] += (!(isalpha(hex2c[1])) ? (hex2c[1] - '0') :
		 ((hex2c[1] & 0xdf) - 'A' + 10));
    }
  }

  gen[i]='\0';
  return gen;
}