bin/ps/fmt.c

   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
  47 static char *cmdpart(char *);
  48 static char *shquote(char **);
  49
  50 static char *
  51 shquote(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
  92 static char *
  93 cmdpart(char *arg0)
  94 {
  95         char *cp;
  96
  97         return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
  98 }
  99
 100 const char *
 101 fmt_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 }