File: misc.c

package info (click to toggle)
bc 1.07.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 2,500 kB
  • sloc: ansic: 7,596; sh: 1,468; yacc: 1,110; lex: 342; makefile: 91
file content (190 lines) | stat: -rw-r--r-- 4,484 bytes parent folder | download
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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/* 
 * misc. functions for the "dc" Desk Calculator language.
 *
 * Copyright (C) 1994, 1997, 1998, 2000, 2006, 2008, 2013
 * Free Software Foundation, Inc.
 *
 * This program 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.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

/* This module contains miscellaneous functions that have no
 * special knowledge of any private data structures.
 * They could each be moved to their own separate modules,
 * but are aggregated here as a matter of convenience.
 */

#include "config.h"

#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
#  include <strings.h>
# endif
#endif
#include <ctype.h>
#ifndef isgraph
# ifndef HAVE_ISGRAPH
#  define isgraph isprint
# endif
#endif
#include <getopt.h>
#include "dc.h"
#include "dc-proto.h"

#ifndef EXIT_FAILURE	/* C89 <stdlib.h> */
# define EXIT_FAILURE	1
#endif


/* print an "out of memory" diagnostic and exit program */
void
dc_memfail DC_DECLVOID()
{
	fprintf(stderr, "%s: out of memory\n", progname);
	exit(EXIT_FAILURE);
}

/* malloc or die */
void *
dc_malloc DC_DECLARG((len))
	size_t len DC_DECLEND
{
	void *result = malloc(len);

	if (result == NULL)
		dc_memfail();
	return result;
}


/* print the id in a human-understandable form
 *  fp is the output stream to place the output on
 *  id is the name of the register (or command) to be printed
 *  suffix is a modifier (such as "stack") to be printed
 */
void
dc_show_id DC_DECLARG((fp, id, suffix))
	FILE *fp DC_DECLSEP
	int id DC_DECLSEP
	const char *suffix DC_DECLEND
{
	if (isgraph(id))
		fprintf(fp, "'%c' (%#o)%s", (unsigned int) id, id, suffix);
	else
		fprintf(fp, "%#o%s", (unsigned int) id, suffix);
	checkferror_output(fp);
}


/* report that corrupt data has been detected;
 * use the msg and regid (if nonnegative) to give information
 * about where the garbage was found,
 *
 * will abort() so that a debugger might be used to help find
 * the bug
 */
/* If this routine is called, then there is a bug in the code;
 * i.e. it is _not_ a data or user error
 */
void
dc_garbage DC_DECLARG((msg, regid))
	const char *msg DC_DECLSEP
	int regid DC_DECLEND
{
	if (regid < 0) {
		fprintf(stderr, "%s: garbage %s\n", progname, msg);
	} else {
		fprintf(stderr, "%s:%s register ", progname, msg);
		dc_show_id(stderr, regid, " is garbage\n");
	}
	abort();
}


/* call system() with the passed string;
 * if the string contains a newline, terminate the string
 * there before calling system.
 * Return a pointer to the first unused character in the string
 * (i.e. past the '\n' if there was one, to the '\0' otherwise).
 */
const char *
dc_system DC_DECLARG((s))
	const char *s DC_DECLEND
{
	const char *p;
	char *tmpstr;
	size_t len;

	p = strchr(s, '\n');
	if (p != NULL) {
		len = (size_t) (p - s);
		tmpstr = dc_malloc(len + 1);
		strncpy(tmpstr, s, len);
		tmpstr[len] = '\0';
		system(tmpstr);
		free(tmpstr);
		return p + 1;
	}
	system(s);
	return s + strlen(s);
}


/* print out the indicated value */
void
dc_print DC_DECLARG((value, obase, newline_p, discard_p))
	dc_data value DC_DECLSEP
	int obase DC_DECLSEP
	dc_newline newline_p DC_DECLSEP
	dc_discard discard_p DC_DECLEND
{
	if (value.dc_type == DC_NUMBER) {
		dc_out_num(value.v.number, obase, discard_p);
	} else if (value.dc_type == DC_STRING) {
		dc_out_str(value.v.string, discard_p);
	} else {
		dc_garbage("in data being printed", -1);
	}
	if (newline_p == DC_WITHNL)
		putchar ('\n');
	fflush(stdout);
}

/* return a duplicate of the passed value, regardless of type */
dc_data
dc_dup DC_DECLARG((value))
	dc_data value DC_DECLEND
{
	if (value.dc_type!=DC_NUMBER && value.dc_type!=DC_STRING)
		dc_garbage("in value being duplicated", -1);
	if (value.dc_type == DC_NUMBER)
		return dc_dup_num(value.v.number);
	/*else*/
	return dc_dup_str(value.v.string);
}


/*
 * Local Variables:
 * mode: C
 * tab-width: 4
 * End:
 * vi: set ts=4 :
 */