fmt.c revision 99457 
1/*-
2 * Copyright (c) 1992, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if 0
35#ifndef lint
36static char sccsid[] = "@(#)fmt.c	8.4 (Berkeley) 4/15/94";
37#endif
38#endif
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/bin/ps/fmt.c 99457 2002-07-05 15:58:27Z mike $");
41
42#include <sys/types.h>
43#include <sys/time.h>
44#include <sys/resource.h>
45
46#include <err.h>
47#include <limits.h>
48#include <stdio.h>
49#include <stdint.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53#include <vis.h>
54
55#include "ps.h"
56
57static char *cmdpart(char *);
58static char *shquote(char **);
59
60static char *
61shquote(char **argv)
62{
63	long arg_max;
64	static size_t buf_size;
65	size_t len;
66	char **p, *dst, *src;
67	static char *buf = NULL;
68
69	if (buf == NULL) {
70		if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
71			errx(1, "sysconf _SC_ARG_MAX failed");
72		if (arg_max >= LONG_MAX / 4 || 4 * arg_max + 1 > SIZE_MAX)
73			errx(1, "sysconf _SC_ARG_MAX preposterously large");
74		buf_size = 4 * arg_max + 1;
75		if ((buf = malloc(buf_size)) == NULL)
76			errx(1, "malloc failed");
77	}
78
79	if (*argv == NULL) {
80		buf[0] = '\0';
81		return (buf);
82	}
83	dst = buf;
84	for (p = argv; (src = *p++) != NULL; ) {
85		if (*src == '\0')
86			continue;
87		len = (buf_size - 1 - (dst - buf)) / 4;
88		strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
89		    VIS_NL | VIS_CSTYLE);
90		while (*dst != '\0')
91			dst++;
92		if ((buf_size - 1 - (dst - buf)) / 4 > 0)
93			*dst++ = ' ';
94	}
95	/* Chop off trailing space */
96	if (dst != buf && dst[-1] == ' ')
97		dst--;
98	*dst = '\0';
99	return (buf);
100}
101
102static char *
103cmdpart(char *arg0)
104{
105	char *cp;
106
107	return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
108}
109
110const char *
111fmt_argv(char **argv, char *cmd, size_t maxlen)
112{
113	size_t len;
114	char *ap, *cp;
115
116	if (argv == NULL || argv[0] == NULL) {
117		if (cmd == NULL)
118			return ("");
119		ap = NULL;
120		len = maxlen + 3;
121	} else {
122		ap = shquote(argv);
123		len = strlen(ap) + maxlen + 4;
124	}
125	cp = malloc(len);
126	if (cp == NULL)
127		errx(1, "malloc failed");
128	if (ap == NULL)
129		sprintf(cp, " (%.*s)", (int)maxlen, cmd);
130	else if (strncmp(cmdpart(argv[0]), cmd, maxlen) != 0)
131		sprintf(cp, "%s (%.*s)", ap, (int)maxlen, cmd);
132	else
133		(void) strcpy(cp, ap);
134	return (cp);
135}
136