usr.bin/lam/lam.c

   1 /*-
   2  * Copyright (c) 1993
   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  * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)lam.c    8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/lam/lam.c,v 1.3.2.3 2001/08/11 03:03:19 mike Exp $
  32  * $DragonFly: src/usr.bin/lam/lam.c,v 1.3 2003/10/04 20:36:47 hmp Exp $
  33  */
  34
  35 /*
  36  *      lam - laminate files
  37  *      Author:  John Kunze, UCB
  38  */
  39
  40 #include <ctype.h>
  41 #include <err.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #define MAXOFILES       20
  47 #define BIGBUFSIZ       5 * BUFSIZ
  48
  49 struct  openfile {              /* open file structure */
  50         FILE    *fp;            /* file pointer */
  51         short   eof;            /* eof flag */
  52         short   pad;            /* pad flag for missing columns */
  53         char    eol;            /* end of line character */
  54         const char *sepstring;  /* string to print before each line */
  55         const char *format;     /* printf(3) style string spec. */
  56 }       input[MAXOFILES];
  57
  58 int     morefiles;              /* set by getargs(), changed by gatherline() */
  59 int     nofinalnl;              /* normally append \n to each output line */
  60 char    line[BIGBUFSIZ];
  61 char    *linep;
  62
  63 static char    *gatherline(struct openfile *);
  64 static void     getargs(char *[]);
  65 static char    *pad(struct openfile *);
  66 static void     usage(void);
  67
  68 int
  69 main(int argc __unused, char *argv[])
  70 {
  71         struct  openfile *ip;
  72
  73         getargs(argv);
  74         if (!morefiles)
  75                 usage();
  76         for (;;) {
  77                 linep = line;
  78                 for (ip = input; ip->fp != NULL; ip++)
  79                         linep = gatherline(ip);
  80                 if (!morefiles)
  81                         exit(0);
  82                 fputs(line, stdout);
  83                 fputs(ip->sepstring, stdout);
  84                 if (!nofinalnl)
  85                         putchar('\n');
  86         }
  87 }
  88
  89 static void
  90 getargs(char *av[])
  91 {
  92         struct  openfile *ip = input;
  93         char *p, *c;
  94         static char fmtbuf[BUFSIZ];
  95         char *fmtp = fmtbuf;
  96         int P, S, F, T;
  97
  98         P = S = F = T = 0;              /* capitalized options */
  99         while ((p = *++av) != NULL) {
 100                 if (*p != '-' || !p[1]) {
 101                         if (++morefiles >= MAXOFILES)
 102                                 errx(1, "too many input files");
 103                         if (*p == '-')
 104                                 ip->fp = stdin;
 105                         else if ((ip->fp = fopen(p, "r")) == NULL) {
 106                                 err(1, "%s", p);
 107                         }
 108                         ip->pad = P;
 109                         if (!ip->sepstring)
 110                                 ip->sepstring = (S ? (ip-1)->sepstring : "");
 111                         if (!ip->format)
 112                                 ip->format = ((P || F) ? (ip-1)->format : "%s");
 113                         if (!ip->eol)
 114                                 ip->eol = (T ? (ip-1)->eol : '\n');
 115                         ip++;
 116                         continue;
 117                 }
 118                 c = ++p;
 119                 switch (tolower(*c)) {
 120                 case 's':
 121                         if (*++p || (p = *++av))
 122                                 ip->sepstring = p;
 123                         else
 124                                 errx(1, "need string after -%s", c);
 125                         S = (*c == 'S' ? 1 : 0);
 126                         break;
 127                 case 't':
 128                         if (*++p || (p = *++av))
 129                                 ip->eol = *p;
 130                         else
 131                                 errx(1, "need character after -%s", c);
 132                         T = (*c == 'T' ? 1 : 0);
 133                         nofinalnl = 1;
 134                         break;
 135                 case 'p':
 136                         ip->pad = 1;
 137                         P = (*c == 'P' ? 1 : 0);
 138                         /* FALLTHROUGH */
 139                 case 'f':
 140                         F = (*c == 'F' ? 1 : 0);
 141                         if (*++p || (p = *++av)) {
 142                                 fmtp += strlen(fmtp) + 1;
 143                                 if (fmtp >= fmtbuf + sizeof(fmtbuf))
 144                                         errx(1, "no more format space");
 145                                 /* restrict format string to only valid width formatters */
 146                                 if (strspn(p, "-.0123456789") != strlen(p))
 147                                         errx(1, "invalid format string `%s'", p);
 148                                 if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
 149                                     >= fmtbuf + sizeof(fmtbuf) - fmtp)
 150                                         errx(1, "no more format space");
 151                                 ip->format = fmtp;
 152                         }
 153                         else
 154                                 errx(1, "need string after -%s", c);
 155                         break;
 156                 default:
 157                         errx(1, "what do you mean by -%s?", c);
 158                         break;
 159                 }
 160         }
 161         ip->fp = NULL;
 162         if (!ip->sepstring)
 163                 ip->sepstring = "";
 164 }
 165
 166 static char *
 167 pad(struct openfile *ip)
 168 {
 169         char *lp = linep;
 170
 171         strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
 172         lp += strlen(lp);
 173         if (ip->pad) {
 174                 snprintf(lp, line + sizeof(line) - lp, ip->format, "");
 175                 lp += strlen(lp);
 176         }
 177         return (lp);
 178 }
 179
 180 static char *
 181 gatherline(struct openfile *ip)
 182 {
 183         char s[BUFSIZ];
 184         int c;
 185         char *p;
 186         char *lp = linep;
 187         char *end = s + sizeof(s) - 1;
 188
 189         if (ip->eof)
 190                 return (pad(ip));
 191         for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
 192                 if ((*p = c) == ip->eol)
 193                         break;
 194         *p = '\0';
 195         if (c == EOF) {
 196                 ip->eof = 1;
 197                 if (ip->fp == stdin)
 198                         fclose(stdin);
 199                 morefiles--;
 200                 return (pad(ip));
 201         }
 202         strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
 203         lp += strlen(lp);
 204         snprintf(lp, line + sizeof(line) - lp, ip->format, s);
 205         lp += strlen(lp);
 206         return (lp);
 207 }
 208
 209 static void
 210 usage(void)
 211 {
 212         fprintf(stderr, "%s\n%s\n",
 213 "usage: lam [ -f min.max ] [ -s sepstring ] [ -t c ] file ...",
 214 "       lam [ -p min.max ] [ -s sepstring ] [ -t c ] file ...");
 215         exit(1);
 216 }