w/fmt.c

   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 #include <sys/cdefs.h>
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)fmt.c       8.4 (Berkeley) 4/15/94";
  39 #endif
  40 #endif
  41
  42 #include <sys/types.h>
  43 #include <sys/time.h>
  44 #include <sys/resource.h>
  45
  46 #include <err.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <vis.h>
  52
  53 //#include "ps.h"
  54
  55 static char *cmdpart(char *);
  56 static char *shquote(char **);
  57
  58 /*
  59  * XXX
  60  * This is a stub until marc does the real one.
  61  */
  62 static char *
  63 shquote(char **argv)
  64 {
  65         static long arg_max = -1;
  66         size_t len;
  67         char **p, *dst, *src;
  68         static char *buf = NULL;
  69
  70         if (buf == NULL) {
  71                 if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
  72                         errx(1, "sysconf _SC_ARG_MAX failed");
  73                 if ((buf = malloc((u_int)(4 * arg_max)  +  1)) == NULL)
  74                         errx(1, "malloc failed");
  75         }
  76
  77         if (*argv == 0) {
  78                 buf[0] = 0;
  79                 return (buf);
  80         }
  81         dst = buf;
  82         for (p = argv; (src = *p++) != 0; ) {
  83                 if (*src == 0)
  84                         continue;
  85                 len = (size_t)(4 * arg_max - (dst - buf)) / 4;
  86                 strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
  87                     VIS_NL | VIS_CSTYLE);
  88                 while (*dst)
  89                         dst++;
  90                 if ((4 * arg_max - (dst - buf)) / 4 > 0)
  91                         *dst++ = ' ';
  92         }
  93         /* Chop off trailing space */
  94         if (dst != buf && dst[-1] == ' ')
  95                 dst--;
  96         *dst = '\0';
  97         return (buf);
  98 }
  99
 100 static char *
 101 cmdpart(char *arg0)
 102 {
 103         char *cp;
 104
 105         return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
 106 }
 107
 108 const char *
 109 fmt_argv(char **argv, char *cmd, size_t maxlen)
 110 {
 111         size_t len;
 112         char *ap, *cp;
 113
 114         if (argv == NULL || argv[0] == NULL) {
 115                 if (cmd == NULL)
 116                         return ("");
 117                 ap = NULL;
 118                 len = maxlen + 3;
 119         } else {
 120                 ap = shquote(argv);
 121                 len = strlen(ap) + maxlen + 4;
 122         }
 123         cp = malloc(len);
 124         if (cp == NULL)
 125                 return (NULL);
 126         if (ap == NULL)
 127                 sprintf(cp, " (%.*s)", (int)maxlen, cmd);
 128         else if (strncmp(cmdpart(argv[0]), cmd, maxlen) != 0)
 129                 sprintf(cp, "%s (%.*s)", ap, (int)maxlen, cmd);
 130         else
 131                 (void) strcpy(cp, ap);
 132         return (cp);
 133 }