NetBSD/gnu/usr.bin/dc/misc.c

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/*
* misc. functions for the "dc" Desk Calculator language.
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*
* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
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*
* 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 2, 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, you can either send email to this
* program's author (see below) or write to: The Free Software Foundation,
* Inc.; 675 Mass Ave. Cambridge, MA 02139, USA.
*/
/* This module contains miscelaneous functions that have no
* special knowledge of any private data structures.
* They could all be moved to their own separate modules, but
* are agglomerated here for 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>
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#include "dc.h"
#include "dc-proto.h"
#include "version.h"
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#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)
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", id, id, suffix);
else
fprintf(fp, "%#o%s", id, suffix);
}
/* 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) {
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fprintf(stderr, "%s: garbage %s\n", progname, msg);
} else {
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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) {
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len = 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))
dc_data value DC_DECLSEP
int obase DC_DECLEND
{
if (value.dc_type == DC_NUMBER) {
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dc_out_num(value.v.number, obase, DC_TRUE, DC_FALSE);
} else if (value.dc_type == DC_STRING) {
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dc_out_str(value.v.string, DC_TRUE, DC_FALSE);
} else {
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dc_garbage("in data being printed", -1);
}
}
/* 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);
}