fmt.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static char sccsid[] = "@(#)fmt.c	8.4 (Berkeley) 4/15/94";
33#endif
34#endif
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: stable/11/bin/ps/fmt.c 331722 2018-03-29 02:50:57Z eadler $");
38
39#include <sys/types.h>
40#include <sys/time.h>
41#include <sys/resource.h>
42
43#include <err.h>
44#include <limits.h>
45#include <stdio.h>
46#include <stdint.h>
47#include <stdlib.h>
48#include <string.h>
49#include <unistd.h>
50#include <vis.h>
51
52#include "ps.h"
53
54static char *cmdpart(char *);
55static char *shquote(char **);
56
57static char *
58shquote(char **argv)
59{
60	long arg_max;
61	static size_t buf_size;
62	size_t len;
63	char **p, *dst, *src;
64	static char *buf = NULL;
65
66	if (buf == NULL) {
67		if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
68			errx(1, "sysconf _SC_ARG_MAX failed");
69		if (arg_max >= LONG_MAX / 4 || arg_max >= (long)(SIZE_MAX / 4))
70			errx(1, "sysconf _SC_ARG_MAX preposterously large");
71		buf_size = 4 * arg_max + 1;
72		if ((buf = malloc(buf_size)) == NULL)
73			errx(1, "malloc failed");
74	}
75
76	if (*argv == NULL) {
77		buf[0] = '\0';
78		return (buf);
79	}
80	dst = buf;
81	for (p = argv; (src = *p++) != NULL; ) {
82		if (*src == '\0')
83			continue;
84		len = (buf_size - 1 - (dst - buf)) / 4;
85		strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
86		    VIS_NL | VIS_CSTYLE);
87		while (*dst != '\0')
88			dst++;
89		if ((buf_size - 1 - (dst - buf)) / 4 > 0)
90			*dst++ = ' ';
91	}
92	/* Chop off trailing space */
93	if (dst != buf && dst[-1] == ' ')
94		dst--;
95	*dst = '\0';
96	return (buf);
97}
98
99static char *
100cmdpart(char *arg0)
101{
102	char *cp;
103
104	return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
105}
106
107const char *
108fmt_argv(char **argv, char *cmd, char *thread, size_t maxlen)
109{
110	size_t len;
111	char *ap, *cp;
112
113	if (argv == NULL || argv[0] == NULL) {
114		if (cmd == NULL)
115			return ("");
116		ap = NULL;
117		len = maxlen + 3;
118	} else {
119		ap = shquote(argv);
120		len = strlen(ap) + maxlen + 4;
121	}
122	cp = malloc(len);
123	if (cp == NULL)
124		errx(1, "malloc failed");
125	if (ap == NULL) {
126		if (thread != NULL) {
127			asprintf(&ap, "%s/%s", cmd, thread);
128			sprintf(cp, "[%.*s]", (int)maxlen, ap);
129			free(ap);
130		} else
131			sprintf(cp, "[%.*s]", (int)maxlen, cmd);
132	} else if (strncmp(cmdpart(argv[0]), cmd, maxlen) != 0)
133		sprintf(cp, "%s (%.*s)", ap, (int)maxlen, cmd);
134	else
135		strcpy(cp, ap);
136	return (cp);
137}
138