usr.bin/lam/lam.c

   1 /*      $NetBSD: lam.c,v 1.8 2011/09/04 20:28:09 joerg Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1993
   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/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)lam.c       8.1 (Berkeley) 6/6/93";
  41 #endif
  42 __RCSID("$NetBSD: lam.c,v 1.8 2011/09/04 20:28:09 joerg Exp $");
  43 #endif /* not lint */
  44
  45 /*
  46  *      lam - laminate files
  47  *      Author:  John Kunze, UCB
  48  */
  49
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55
  56 #define MAXOFILES       20
  57 #define BIGBUFSIZ       5 * BUFSIZ
  58
  59 struct  openfile {              /* open file structure */
  60         FILE    *fp;            /* file pointer */
  61         short   eof;            /* eof flag */
  62         short   pad;            /* pad flag for missing columns */
  63         char    eol;            /* end of line character */
  64         const char *sepstring;  /* string to print before each line */
  65         const char *format;     /* printf(3) style string spec. */
  66 }       input[MAXOFILES];
  67
  68 static int      morefiles;              /* set by getargs(), changed by gatherline() */
  69 static int      nofinalnl;              /* normally append \n to each output line */
  70 static char     line[BIGBUFSIZ];
  71 static char     *linep;
  72
  73 __dead static void       error(const char *, const char *);
  74 static char     *gatherline(struct openfile *);
  75 static void      getargs(char *[]);
  76 static char     *pad(struct openfile *);
  77
  78 int
  79 main(int argc, char *argv[])
  80 {
  81         struct  openfile *ip;
  82
  83         getargs(argv);
  84         if (!morefiles)
  85                 error("lam - laminate files", "");
  86         for (;;) {
  87                 linep = line;
  88                 for (ip = input; ip->fp != NULL; ip++)
  89                         linep = gatherline(ip);
  90                 if (!morefiles)
  91                         exit(0);
  92                 fputs(line, stdout);
  93                 fputs(ip->sepstring, stdout);
  94                 if (!nofinalnl)
  95                         putchar('\n');
  96         }
  97 }
  98
  99 static void
 100 getargs(char *av[])
 101 {
 102         struct openfile *ip = input;
 103         char *p, *c;
 104         static char fmtbuf[BUFSIZ];
 105         char *fmtp = fmtbuf;
 106         int P, S, F, T;
 107
 108         P = S = F = T = 0;              /* capitalized options */
 109         while ((p = *++av) != NULL) {
 110                 if (*p != '-' || !p[1]) {
 111                         if (++morefiles >= MAXOFILES)
 112                                 errx(1, "too many input files");
 113                         if (*p == '-')
 114                                 ip->fp = stdin;
 115                         else if ((ip->fp = fopen(p, "r")) == NULL)
 116                                 errx(1, "open %s", p);
 117                         ip->pad = P;
 118                         if (!ip->sepstring)
 119                                 ip->sepstring = (S ? (ip-1)->sepstring : "");
 120                         if (!ip->format)
 121                                 ip->format = ((P || F) ? (ip-1)->format : "%s");
 122                         if (!ip->eol)
 123                                 ip->eol = (T ? (ip-1)->eol : '\n');
 124                         ip++;
 125                         continue;
 126                 }
 127                 c = ++p;
 128                 switch (tolower((unsigned char) *c)) {
 129                 case 's':
 130                         if (*++p || (p = *++av))
 131                                 ip->sepstring = p;
 132                         else
 133                                 error("Need string after -%s", c);
 134                         S = (*c == 'S' ? 1 : 0);
 135                         break;
 136                 case 't':
 137                         if (*++p || (p = *++av))
 138                                 ip->eol = *p;
 139                         else
 140                                 error("Need character after -%s", c);
 141                         T = (*c == 'T' ? 1 : 0);
 142                         nofinalnl = 1;
 143                         break;
 144                 case 'p':
 145                         ip->pad = 1;
 146                         P = (*c == 'P' ? 1 : 0);
 147                         /* FALLTHROUGH */
 148                 case 'f':
 149                         F = (*c == 'F' ? 1 : 0);
 150                         if (*++p || (p = *++av)) {
 151                                 fmtp += strlen(fmtp) + 1;
 152                                 if (fmtp >= fmtbuf + sizeof(fmtbuf))
 153                                         errx(1, "no more format space");
 154                                 /* restrict format string to only valid width formatters */
 155                                 if (strspn(p, "-.0123456789") != strlen(p))
 156                                         errx(1, "invalid format string `%s'", p);
 157                                 if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
 158                                         >= fmtbuf + sizeof(fmtbuf) - fmtp)
 159                                                 errx(1, "no more format space");
 160                                 sprintf(fmtp, "%%%ss", p);
 161                                 ip->format = fmtp;
 162                         }
 163                         else
 164                                 error("Need string after -%s", c);
 165                         break;
 166                 default:
 167                         error("What do you mean by -%s?", c);
 168                         break;
 169                 }
 170         }
 171         ip->fp = NULL;
 172         if (!ip->sepstring)
 173                 ip->sepstring = "";
 174 }
 175
 176 static char *
 177 pad(struct openfile *ip)
 178 {
 179         char *lp = linep;
 180
 181         strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
 182         lp += strlen(lp);
 183         if (ip->pad) {
 184                 snprintf(lp, line + sizeof(line) - lp, ip->format, "");
 185                 lp += strlen(lp);
 186         }
 187         return (lp);
 188 }
 189
 190 static char *
 191 gatherline(struct openfile *ip)
 192 {
 193         char s[BUFSIZ];
 194         int c;
 195         char *p;
 196         char *lp = linep;
 197         char *end = s + sizeof(s) - 1;
 198
 199         if (ip->eof)
 200                 return (pad(ip));
 201         for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
 202                 if ((*p = c) == ip->eol)
 203                         break;
 204         *p = '\0';
 205         if (c == EOF) {
 206                 ip->eof = 1;
 207                 if (ip->fp == stdin)
 208                         fclose(stdin);
 209                 morefiles--;
 210                 return (pad(ip));
 211         }
 212         strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
 213         lp += strlen(lp);
 214         snprintf(lp, line + sizeof(line) - lp, ip->format, s);
 215         lp += strlen(lp);
 216         return (lp);
 217 }
 218
 219 static void
 220 error(const char *msg, const char *s)
 221 {
 222         warnx(msg, s);
 223         fprintf(stderr,
 224 "\nUsage:  lam [ -[fp] min.max ] [ -s sepstring ] [ -t c ] file ...\n");
 225         if (strncmp("lam - ", msg, 6) == 0)
 226                 fprintf(stderr, "Options:\n\t%s\t%s\t%s\t%s\t%s",
 227                     "-f min.max field widths for file fragments\n",
 228                     "-p min.max like -f, but pad missing fragments\n",
 229                     "-s sepstring       fragment separator\n",
 230 "-t c           input line terminator is c, no \\n after output lines\n",
 231                     "Capitalized options affect more than one file.\n");
 232         exit(1);
 233 }