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. 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  * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)lam.c    8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/lam/lam.c,v 1.3.2.3 2001/08/11 03:03:19 mike Exp $
  36  * $DragonFly: src/usr.bin/lam/lam.c,v 1.3 2003/10/04 20:36:47 hmp Exp $
  37  */
  38
  39 /*
  40  *      lam - laminate files
  41  *      Author:  John Kunze, UCB
  42  */
  43
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 #define MAXOFILES       20
  51 #define BIGBUFSIZ       5 * BUFSIZ
  52
  53 struct  openfile {              /* open file structure */
  54         FILE    *fp;            /* file pointer */
  55         short   eof;            /* eof flag */
  56         short   pad;            /* pad flag for missing columns */
  57         char    eol;            /* end of line character */
  58         const char *sepstring;  /* string to print before each line */
  59         const char *format;     /* printf(3) style string spec. */
  60 }       input[MAXOFILES];
  61
  62 int     morefiles;              /* set by getargs(), changed by gatherline() */
  63 int     nofinalnl;              /* normally append \n to each output line */
  64 char    line[BIGBUFSIZ];
  65 char    *linep;
  66
  67 static char    *gatherline(struct openfile *);
  68 static void     getargs(char *[]);
  69 static char    *pad(struct openfile *);
  70 static void     usage(void);
  71
  72 int
  73 main(int argc __unused, char *argv[])
  74 {
  75         struct  openfile *ip;
  76
  77         getargs(argv);
  78         if (!morefiles)
  79                 usage();
  80         for (;;) {
  81                 linep = line;
  82                 for (ip = input; ip->fp != NULL; ip++)
  83                         linep = gatherline(ip);
  84                 if (!morefiles)
  85                         exit(0);
  86                 fputs(line, stdout);
  87                 fputs(ip->sepstring, stdout);
  88                 if (!nofinalnl)
  89                         putchar('\n');
  90         }
  91 }
  92
  93 static void
  94 getargs(char *av[])
  95 {
  96         struct  openfile *ip = input;
  97         char *p, *c;
  98         static char fmtbuf[BUFSIZ];
  99         char *fmtp = fmtbuf;
 100         int P, S, F, T;
 101
 102         P = S = F = T = 0;              /* capitalized options */
 103         while ((p = *++av) != NULL) {
 104                 if (*p != '-' || !p[1]) {
 105                         if (++morefiles >= MAXOFILES)
 106                                 errx(1, "too many input files");
 107                         if (*p == '-')
 108                                 ip->fp = stdin;
 109                         else if ((ip->fp = fopen(p, "r")) == NULL) {
 110                                 err(1, "%s", p);
 111                         }
 112                         ip->pad = P;
 113                         if (!ip->sepstring)
 114                                 ip->sepstring = (S ? (ip-1)->sepstring : "");
 115                         if (!ip->format)
 116                                 ip->format = ((P || F) ? (ip-1)->format : "%s");
 117                         if (!ip->eol)
 118                                 ip->eol = (T ? (ip-1)->eol : '\n');
 119                         ip++;
 120                         continue;
 121                 }
 122                 c = ++p;
 123                 switch (tolower(*c)) {
 124                 case 's':
 125                         if (*++p || (p = *++av))
 126                                 ip->sepstring = p;
 127                         else
 128                                 errx(1, "need string after -%s", c);
 129                         S = (*c == 'S' ? 1 : 0);
 130                         break;
 131                 case 't':
 132                         if (*++p || (p = *++av))
 133                                 ip->eol = *p;
 134                         else
 135                                 errx(1, "need character after -%s", c);
 136                         T = (*c == 'T' ? 1 : 0);
 137                         nofinalnl = 1;
 138                         break;
 139                 case 'p':
 140                         ip->pad = 1;
 141                         P = (*c == 'P' ? 1 : 0);
 142                         /* FALLTHROUGH */
 143                 case 'f':
 144                         F = (*c == 'F' ? 1 : 0);
 145                         if (*++p || (p = *++av)) {
 146                                 fmtp += strlen(fmtp) + 1;
 147                                 if (fmtp >= fmtbuf + sizeof(fmtbuf))
 148                                         errx(1, "no more format space");
 149                                 /* restrict format string to only valid width formatters */
 150                                 if (strspn(p, "-.0123456789") != strlen(p))
 151                                         errx(1, "invalid format string `%s'", p);
 152                                 if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
 153                                     >= fmtbuf + sizeof(fmtbuf) - fmtp)
 154                                         errx(1, "no more format space");
 155                                 ip->format = fmtp;
 156                         }
 157                         else
 158                                 errx(1, "need string after -%s", c);
 159                         break;
 160                 default:
 161                         errx(1, "what do you mean by -%s?", c);
 162                         break;
 163                 }
 164         }
 165         ip->fp = NULL;
 166         if (!ip->sepstring)
 167                 ip->sepstring = "";
 168 }
 169
 170 static char *
 171 pad(struct openfile *ip)
 172 {
 173         char *lp = linep;
 174
 175         strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
 176         lp += strlen(lp);
 177         if (ip->pad) {
 178                 snprintf(lp, line + sizeof(line) - lp, ip->format, "");
 179                 lp += strlen(lp);
 180         }
 181         return (lp);
 182 }
 183
 184 static char *
 185 gatherline(struct openfile *ip)
 186 {
 187         char s[BUFSIZ];
 188         int c;
 189         char *p;
 190         char *lp = linep;
 191         char *end = s + sizeof(s) - 1;
 192
 193         if (ip->eof)
 194                 return (pad(ip));
 195         for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
 196                 if ((*p = c) == ip->eol)
 197                         break;
 198         *p = '\0';
 199         if (c == EOF) {
 200                 ip->eof = 1;
 201                 if (ip->fp == stdin)
 202                         fclose(stdin);
 203                 morefiles--;
 204                 return (pad(ip));
 205         }
 206         strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
 207         lp += strlen(lp);
 208         snprintf(lp, line + sizeof(line) - lp, ip->format, s);
 209         lp += strlen(lp);
 210         return (lp);
 211 }
 212
 213 static void
 214 usage(void)
 215 {
 216         fprintf(stderr, "%s\n%s\n",
 217 "usage: lam [ -f min.max ] [ -s sepstring ] [ -t c ] file ...",
 218 "       lam [ -p min.max ] [ -s sepstring ] [ -t c ] file ...");
 219         exit(1);
 220 }