fmt.c revision 99110 
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 99110 2002-06-30 05:15:05Z obrien $");
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 <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52#include <vis.h>
53
54#include "ps.h"
55
56static char *cmdpart(char *);
57static char *shquote(char **);
58
59static char *
60shquote(char **argv)
61{
62	long arg_max;
63	static size_t buf_size;
64	size_t len;
65	char **p, *dst, *src;
66	static char *buf = NULL;
67
68	if (buf == NULL) {
69		if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
70			errx(1, "sysconf _SC_ARG_MAX failed");
71		if (arg_max >= LONG_MAX / 4 || 4 * arg_max + 1 > SIZE_MAX)
72			errx(1, "sysconf _SC_ARG_MAX preposterously large");
73		buf_size = 4 * arg_max + 1;
74		if ((buf = malloc(buf_size)) == NULL)
75			errx(1, "malloc failed");
76	}
77
78	if (*argv == NULL) {
79		buf[0] = '\0';
80		return (buf);
81	}
82	dst = buf;
83	for (p = argv; (src = *p++) != NULL; ) {
84		if (*src == '\0')
85			continue;
86		len = (buf_size - 1 - (dst - buf)) / 4;
87		strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
88		    VIS_NL | VIS_CSTYLE);
89		while (*dst != '\0')
90			dst++;
91		if ((buf_size - 1 - (dst - buf)) / 4 > 0)
92			*dst++ = ' ';
93	}
94	/* Chop off trailing space */
95	if (dst != buf && dst[-1] == ' ')
96		dst--;
97	*dst = '\0';
98	return (buf);
99}
100
101static char *
102cmdpart(char *arg0)
103{
104	char *cp;
105
106	return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
107}
108
109const char *
110fmt_argv(char **argv, char *cmd, size_t maxlen)
111{
112	size_t len;
113	char *ap, *cp;
114
115	if (argv == NULL || argv[0] == NULL) {
116		if (cmd == NULL)
117			return ("");
118		ap = NULL;
119		len = maxlen + 3;
120	} else {
121		ap = shquote(argv);
122		len = strlen(ap) + maxlen + 4;
123	}
124	cp = malloc(len);
125	if (cp == NULL)
126		errx(1, "malloc failed");
127	if (ap == NULL)
128		sprintf(cp, " (%.*s)", (int)maxlen, cmd);
129	else if (strncmp(cmdpart(argv[0]), cmd, maxlen) != 0)
130		sprintf(cp, "%s (%.*s)", ap, (int)maxlen, cmd);
131	else
132		(void) strcpy(cp, ap);
133	return (cp);
134}
135