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. 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 #include <sys/cdefs.h>
  31
  32 #if 0
  33 #ifndef lint
  34 static char sccsid[] = "@(#)fmt.c       8.4 (Berkeley) 4/15/94";
  35 #endif
  36 #endif
  37
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/resource.h>
  41
  42 #include <err.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <vis.h>
  48
  49 //#include "ps.h"
  50
  51 static char *cmdpart(char *);
  52 static char *shquote(char **);
  53
  54 /*
  55  * XXX
  56  * This is a stub until marc does the real one.
  57  */
  58 static char *
  59 shquote(char **argv)
  60 {
  61         static long arg_max = -1;
  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 ((buf = malloc((u_int)(4 * arg_max)  +  1)) == NULL)
  70                         errx(1, "malloc failed");
  71         }
  72
  73         if (*argv == 0) {
  74                 buf[0] = 0;
  75                 return (buf);
  76         }
  77         dst = buf;
  78         for (p = argv; (src = *p++) != 0; ) {
  79                 if (*src == 0)
  80                         continue;
  81                 len = (size_t)(4 * arg_max - (dst - buf)) / 4;
  82                 strvisx(dst, src, strlen(src) < len ? strlen(src) : len,
  83                     VIS_NL | VIS_CSTYLE);
  84                 while (*dst)
  85                         dst++;
  86                 if ((4 * arg_max - (dst - buf)) / 4 > 0)
  87                         *dst++ = ' ';
  88         }
  89         /* Chop off trailing space */
  90         if (dst != buf && dst[-1] == ' ')
  91                 dst--;
  92         *dst = '\0';
  93         return (buf);
  94 }
  95
  96 static char *
  97 cmdpart(char *arg0)
  98 {
  99         char *cp;
 100
 101         return ((cp = strrchr(arg0, '/')) != NULL ? cp + 1 : arg0);
 102 }
 103
 104 const char *
 105 fmt_argv(char **argv, char *cmd, size_t maxlen)
 106 {
 107         size_t len;
 108         char *ap, *cp;
 109
 110         if (argv == NULL || argv[0] == NULL) {
 111                 if (cmd == NULL)
 112                         return ("");
 113                 ap = NULL;
 114                 len = maxlen + 3;
 115         } else {
 116                 ap = shquote(argv);
 117                 len = strlen(ap) + maxlen + 4;
 118         }
 119         cp = malloc(len);
 120         if (cp == NULL)
 121                 return (NULL);
 122         if (ap == NULL)
 123                 sprintf(cp, " (%.*s)", (int)maxlen, cmd);
 124         else if (strncmp(cmdpart(argv[0]), cmd, maxlen) != 0)
 125                 sprintf(cp, "%s (%.*s)", ap, (int)maxlen, cmd);
 126         else
 127                 (void) strcpy(cp, ap);
 128         return (cp);
 129 }