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/* vim:ts=4
*
* utils.c - man2html utility functions
*
* Author: Robert Luberda <robert@debian.org>, Jan 2003
* Copyright: GPL
*
* "$Id: utils.c,v 1.5 2003-02-02 21:01:39 robert Exp $"
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#include "utils.h"
void error_page(int status, char *s, char *t, ...)
{
va_list p;
switch(status) {
case 400:
printf("Status: 400 Bad Request\n");
break;
case 403:
printf("Status: 403 Forbidden\n");
break;
case 404:
printf("Status: 404 Not Found\n");
break;
case 500:
printf("Status: 500 Internal Server Error\n");
break;
case 0:
default:
break;
}
printf(CONTENTTYPE DOCTYPE);
printf("<HTML><HEAD><TITLE>%s</TITLE></HEAD>\n"
"<BODY>\n<H1>%s</H1>\n", s, s);
va_start(p, t);
vfprintf(stdout, t, p);
va_end(p);
printf("</BODY></HTML>\n");
if (status == 0)
exit(EXIT_SUCCESS);
else
exit(EXIT_FAILURE);
}
char * xstrdup(const char *s)
{
char *p = strdup(s);
if (p == NULL)
error_page(500, "Out of memory",
"Sorry, out of memory, aborting...\n");
return p;
}
void * xmalloc(size_t size)
{
void *p = malloc(size);
if (p == NULL)
error_page(500, "Out of memory",
"Sorry, out of memory, aborting...\n");
return p;
}
void * xrealloc(void *ptr, size_t size)
{
void *p = realloc(ptr,size);
if (p == NULL)
error_page(500, "Out of memory",
"Sorry, out of memory, aborting...\n");
return p;
}
/* decode CGI urls */
char * urldecode(char *s)
{
char *p, *q, *out;
char buf[3];
out = strdup(s);
p = s;
q = out;
while (*p)
{
if (*p == '+')
*q++ = ' ';
else if ((*p == '%') && isxdigit(*(p+1)) && isxdigit(*(p+2)))
{
buf[0] = *(p+1);
buf[1] = *(p+2);
buf[2] = '\0';
*q++ = (char)(strtol(buf, NULL, 16));
p += 2;
}
else
*q++ = *p;
p++;
};
*q = '\0';
return out;
}
/* encode urls */
char * urlencode(char *s)
{
char *p, *q, *out;
char buf[3];
size_t i, len;
len = strlen(s) + 1;
out = (char*) malloc(len * sizeof(char));
p = s;
q = out;
while (*p)
{
if (*p == ' ')
*q++ = '+';
else if (isalnum(*p) || *p == '_' || *p == ':' || *p == '-'
|| *p == '.' || *p == '/')
*q++ = *p;
else
{
sprintf(buf, "%02x", (unsigned char)*p);
len += 2;
i = q - out;
out = (char*) realloc(out, len * sizeof(char));
q = out + i;
*q++ = '%';
*q++ = buf[0];
*q++ = buf[1];
}
p++;
}
*q = '\0';
return out;
}
void print_html_enc(char *s, FILE *f)
{
while (*s)
{
if (*s == '<')
fputs("<", f);
else if (*s == '>')
fputs(">", f);
else if (*s == '&')
fputs("&", f);
else if (*s == '"')
fputs(""", f);
else
fputc(*s, f);
s++;
}
}
int querystring2argv(int *argc, char ***argv)
{
char *t, *s, *q;
char **new_argv;
int new_argc;
if (!(t = getenv("QUERY_STRING")))
return 0;
if (!(s = strstr(t, QUERY_MAGIC_STR)))
return 0;
s += sizeof(QUERY_MAGIC_STR) - 1;
/* kill at first '&' */
if ((q = strstr(s, "&")))
*q = '\0';
s = urldecode(s);
new_argv = malloc(2 * sizeof(char**));
new_argv[0] = *argv[0];
new_argc = 1;
q = strtok(s, " \t\n\r");
while (q)
{
new_argv[new_argc++] = strdup(q);
q = strtok(NULL, " \t\n\r");
new_argv = realloc(new_argv, (new_argc + 1) * sizeof(char**));
}
*(new_argv + new_argc) = NULL;
*argc = new_argc;
*argv = new_argv;
free(s);
return 1;
}
/*
# Do we need lynxcgi URLs? For the moment our criterion is
# 1) HTTP_USER_AGENT=Lynx* and 2) HTTP_HOST is unset.
*/
int is_lynx()
{
char *t;
t = getenv("HTTP_HOST");
if (t && *t)
return 0;
t = getenv("HTTP_USER_AGENT");
if (!t || !*t)
return 0;
return !strncasecmp(t, "lynx", 4);
}
#if UTILS_TEST
int main(int argc, char ** argv)
{
char * s;
querystring2argv(&argc, &argv);
while (argc)
puts(argv[--argc]);
return 0;
}
#endif
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