/*      $NetBSD: lam.c,v 1.8 2011/09/04 20:28:09 joerg Exp $    */

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)lam.c       8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: lam.c,v 1.8 2011/09/04 20:28:09 joerg Exp $");
#endif /* not lint */

/*
 *      lam - laminate files
 *      Author:  John Kunze, UCB
 */

#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAXOFILES       20
#define BIGBUFSIZ       5 * BUFSIZ

struct  openfile {              /* open file structure */
        FILE    *fp;            /* file pointer */
        short   eof;            /* eof flag */
        short   pad;            /* pad flag for missing columns */
        char    eol;            /* end of line character */
        const char *sepstring;  /* string to print before each line */
        const char *format;     /* printf(3) style string spec. */
}       input[MAXOFILES];

static int      morefiles;              /* set by getargs(), changed by gatherline() */
static int      nofinalnl;              /* normally append \n to each output line */
static char     line[BIGBUFSIZ];
static char     *linep;

__dead static void       error(const char *, const char *);
static char     *gatherline(struct openfile *);
static void      getargs(char *[]);
static char     *pad(struct openfile *);

int
main(int argc, char *argv[])
{
        struct  openfile *ip;

        getargs(argv);
        if (!morefiles)
                error("lam - laminate files", "");
        for (;;) {
                linep = line;
                for (ip = input; ip->fp != NULL; ip++)
                        linep = gatherline(ip);
                if (!morefiles)
                        exit(0);
                fputs(line, stdout);
                fputs(ip->sepstring, stdout);
                if (!nofinalnl)
                        putchar('\n');
        }
}

static void
getargs(char *av[])
{
        struct openfile *ip = input;
        char *p, *c;
        static char fmtbuf[BUFSIZ];
        char *fmtp = fmtbuf;
        int P, S, F, T;

        P = S = F = T = 0;              /* capitalized options */
        while ((p = *++av) != NULL) {
                if (*p != '-' || !p[1]) {
                        if (++morefiles >= MAXOFILES)
                                errx(1, "too many input files");
                        if (*p == '-')
                                ip->fp = stdin;
                        else if ((ip->fp = fopen(p, "r")) == NULL)
                                errx(1, "open %s", p);
                        ip->pad = P;
                        if (!ip->sepstring)
                                ip->sepstring = (S ? (ip-1)->sepstring : "");
                        if (!ip->format)
                                ip->format = ((P || F) ? (ip-1)->format : "%s");
                        if (!ip->eol)
                                ip->eol = (T ? (ip-1)->eol : '\n');
                        ip++;
                        continue;
                }
                c = ++p;
                switch (tolower((unsigned char) *c)) {
                case 's':
                        if (*++p || (p = *++av))
                                ip->sepstring = p;
                        else
                                error("Need string after -%s", c);
                        S = (*c == 'S' ? 1 : 0);
                        break;
                case 't':
                        if (*++p || (p = *++av))
                                ip->eol = *p;
                        else
                                error("Need character after -%s", c);
                        T = (*c == 'T' ? 1 : 0);
                        nofinalnl = 1;
                        break;
                case 'p':
                        ip->pad = 1;
                        P = (*c == 'P' ? 1 : 0);
                        /* FALLTHROUGH */
                case 'f':
                        F = (*c == 'F' ? 1 : 0);
                        if (*++p || (p = *++av)) {
                                fmtp += strlen(fmtp) + 1;
                                if (fmtp >= fmtbuf + sizeof(fmtbuf))
                                        errx(1, "no more format space");
                                /* restrict format string to only valid width formatters */
                                if (strspn(p, "-.0123456789") != strlen(p))
                                        errx(1, "invalid format string `%s'", p);
                                if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
                                        >= fmtbuf + sizeof(fmtbuf) - fmtp)
                                                errx(1, "no more format space");
                                sprintf(fmtp, "%%%ss", p);
                                ip->format = fmtp;
                        }
                        else
                                error("Need string after -%s", c);
                        break;
                default:
                        error("What do you mean by -%s?", c);
                        break;
                }
        }
        ip->fp = NULL;
        if (!ip->sepstring)
                ip->sepstring = "";
}

static char *
pad(struct openfile *ip)
{
        char *lp = linep;

        strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
        lp += strlen(lp);
        if (ip->pad) {
                snprintf(lp, line + sizeof(line) - lp, ip->format, "");
                lp += strlen(lp);
        }
        return (lp);
}

static char *
gatherline(struct openfile *ip)
{
        char s[BUFSIZ];
        int c;
        char *p;
        char *lp = linep;
        char *end = s + sizeof(s) - 1;

        if (ip->eof)
                return (pad(ip));
        for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
                if ((*p = c) == ip->eol)
                        break;
        *p = '\0';
        if (c == EOF) {
                ip->eof = 1;
                if (ip->fp == stdin)
                        fclose(stdin);
                morefiles--;
                return (pad(ip));
        }
        strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
        lp += strlen(lp);
        snprintf(lp, line + sizeof(line) - lp, ip->format, s);
        lp += strlen(lp);
        return (lp);
}

static void
error(const char *msg, const char *s)
{
        warnx(msg, s);
        fprintf(stderr,
"\nUsage:  lam [ -[fp] min.max ] [ -s sepstring ] [ -t c ] file ...\n");
        if (strncmp("lam - ", msg, 6) == 0)
                fprintf(stderr, "Options:\n\t%s\t%s\t%s\t%s\t%s",
                    "-f min.max field widths for file fragments\n",
                    "-p min.max like -f, but pad missing fragments\n",
                    "-s sepstring       fragment separator\n",
"-t c           input line terminator is c, no \\n after output lines\n",
                    "Capitalized options affect more than one file.\n");
        exit(1);
}