if.c
3.44 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001-2002, 2007, 2010-2012, 2014-2016 Free
Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include "mail.h"
#define COND_STK_SIZE 64
#define COND_STK_INCR 16
static int *_cond_stack; /* Stack of conditions */
static int _cond_stack_size; /* Number of elements allocated this far */
static int _cond_level; /* Number of nested `if' blocks */
static void _cond_push(int val);
static int _cond_pop(void);
int
if_cond()
{
if (_cond_level == 0)
return 1;
return _cond_stack[_cond_level-1];
}
void
_cond_push(int val)
{
if (!_cond_stack)
{
_cond_stack = calloc(COND_STK_SIZE, sizeof(_cond_stack[0]));
_cond_stack_size = COND_STK_SIZE;
_cond_level = 0;
}
else if (_cond_level >= _cond_stack_size)
{
_cond_stack_size += COND_STK_INCR;
_cond_stack = realloc(_cond_stack,
sizeof(_cond_stack[0])*_cond_stack_size);
}
if (!_cond_stack)
{
mu_error(_("Not enough memory"));
exit (EXIT_FAILURE);
}
_cond_stack[_cond_level++] = val;
}
int
_cond_pop()
{
if (_cond_level == 0)
{
mu_error(_("Internal error: condition stack underflow"));
abort();
}
return _cond_stack[--_cond_level];
}
/*
* i[f] s|r|t
* mail-commands
* el[se]
* mail-commands
* en[dif]
*/
int
mail_if (int argc, char **argv)
{
char *mode;
int cond;
if (argc != 2)
{
/* TRANSLATORS: 'if' is the function name. Do not translate it */
mu_error(_("if requires an argument: s | r | t"));
return 1;
}
if (argv[1][1] != 0)
{
mu_error(_("Valid if arguments are: s | r | t"));
return 1;
}
if (mailvar_get (&mode, "mode", mailvar_type_string, 1))
exit (EXIT_FAILURE);
if (if_cond() == 0)
/* Propagate negative condition */
cond = 0;
else
{
switch (argv[1][0])
{
case 's': /* Send mode */
cond = strcmp(mode, "send") == 0;
break;
case 'r': /* Read mode */
cond = strcmp(mode, "read") == 0;
break;
case 't': /* Stdout is a terminal device? */
cond = isatty (fileno (stdout));
break;
default:
mu_error(_("Valid if arguments are: s | r | t"));
return 1;
}
}
_cond_push(cond);
return 0;
}
int
mail_else (int argc MU_ARG_UNUSED, char **argv MU_ARG_UNUSED)
{
int cond;
if (_cond_level == 0)
{
/* TRANSLATORS: 'else' and 'if' are function names. Do not translate them */
mu_error(_("else without matching if"));
return 1;
}
cond = _cond_pop();
if (if_cond ())
cond = !cond;
_cond_push(cond);
return 0;
}
int
mail_endif (int argc MU_ARG_UNUSED, char **argv MU_ARG_UNUSED)
{
if (_cond_level == 0)
{
/* TRANSLATORS: 'endif' and 'if' are function names. Do not translate them */
mu_error (_("endif without matching if"));
return 1;
}
_cond_pop();
return 1;
}