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/*
mairix - message index builder and finder for maildir folders.
**********************************************************************
* Copyright (C) Richard P. Curnow 2004
* Copyright (C) Andreas Amann 2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
**********************************************************************
*/
#include "mairix.h"
#include <stdlib.h>
#include <sys/types.h>
#include <pwd.h>
#include <ctype.h>
#include <unistd.h>
static int isenv(unsigned char x)/*{{{*/
{
/* Return true if x is valid as part of an environment variable name. */
if (isalnum(x))
return 1;
else if (x == '_')
return 1;
else
return 0;
}
/*}}}*/
static int home_dir_len(void)/*{{{*/
{
struct passwd *foo;
char *lookup;
lookup = getenv("HOME");
if (lookup) {
return strlen(lookup);
}
foo = getpwuid(getuid());
return strlen(foo->pw_dir);
}
/*}}}*/
static char *env_lookup(const char *p, const char *q)/*{{{*/
{
char *var;
char *lookup, *result;
char *s;
var = new_array(char, (q-p)+1);
for (s=var; p<q; p++, s++) {
*s = *p;
}
*s = 0;
lookup = getenv(var);
if (lookup) {
result = new_string(lookup);
} else {
result = NULL;
}
free(var);
return result;
}
/*}}}*/
static int env_lookup_len(const char *p, const char *q) {/*{{{*/
char *foo;
int len;
foo = env_lookup(p, q);
if (!foo) len = 0;
else {
len = strlen(foo);
free(foo);
}
return len;
}
/*}}}*/
static int compute_length(const char *p)/*{{{*/
{
const char *q;
int first;
int len;
first = 1;
len = 0;
while (*p) {
if (first && (*p == '~') && (p[1] == '/')) {
/* Make no attempt to expand ~other_user form */
len += home_dir_len();
p++;
} else if ((*p == '$') && (p[1] == '{')) {
p += 2;
q = p;
while (*q && (*q != '}')) q++;
len += env_lookup_len(p, q);
p = *q ? (q + 1) : q;
} else if (*p == '$') {
p++;
q = p;
while (*q && isenv(*(unsigned char*)q)) q++;
len += env_lookup_len(p, q);
p = q;
} else {
len++;
p++;
}
first = 0;
}
return len;
}
/*}}}*/
static char *append_home_dir(char *to)/*{{{*/
{
struct passwd *foo;
int len;
char *lookup;
lookup = getenv("HOME");
if (lookup) {
len = strlen(lookup);
strcpy(to, lookup);
} else {
foo = getpwuid(getuid());
len = strlen(foo->pw_dir);
strcpy(to, foo->pw_dir);
}
return to + len;
}
/*}}}*/
static char *append_env(char *to, const char *p, const char *q)/*{{{*/
{
char *foo;
int len;
foo = env_lookup(p, q);
if (foo) {
len = strlen(foo);
strcpy(to, foo);
free(foo);
} else {
len = 0;
}
return (to + len);
}
/*}}}*/
static void do_expand(const char *p, char *result)/*{{{*/
{
const char *q;
int first;
first = 1;
while (*p) {
if (first && (*p == '~') && (p[1] == '/')) {
result = append_home_dir(result);
p++;
} else if ((*p == '$') && (p[1] == '{')) {
p += 2;
q = p;
while (*q && (*q != '}')) q++;
result = append_env(result, p, q);
p = *q ? (q + 1) : q;
} else if (*p == '$') {
p++;
q = p;
while (*q && isenv(*(unsigned char*)q)) q++;
result = append_env(result, p, q);
p = q;
} else {
*result++ = *p++;
}
first = 0;
}
*result = 0;
}
/*}}}*/
char *expand_string(const char *p)/*{{{*/
{
/* Return a copy of p, but with
~ expanded to the user's home directory
$env expanded to the value of that environment variable
*/
int len;
char *result;
len = compute_length(p);
result = new_array(char, len+1);
do_expand(p, result);
return result;
}
/*}}}*/
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