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