The UNIX CD Bookshelf/OREILLY_TUCB_UNIX_CD.iso/upt/examples/SOURCES/JOT/TOOLS.Z/TOOLS/tools/lam.c

C/C++ Source or Header | 1991-11-07 | 3.9 KB | 193 lines

/* Copyright (c) 1983 Regents of the University of California */

#ifndef lint
static char sccsid[] = "@(#)lam.c    4.5    (Berkeley)    5/19/88";
#endif not lint

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

#include <stdio.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 */
    char    *sepstring;    /* string to print before each line */
    char    *format;    /* printf(3) style string spec. */
}    input[MAXOFILES];

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

main(argc, argv)
int    argc;
char    **argv;
{
    register struct    openfile    *ip;
    char    *gatherline();

    setbuf(stdout, buf);
    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');
    }
}

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

    P = S = F = T = 0;        /* capitalized options */
    while (p = *++av) {
        if (*p != '-' || !p[1]) {
            morefiles++;
            if (*p == '-')
                ip->fp = stdin;
            else if ((ip->fp = fopen(p, "r")) == NULL) {
                perror(p);
                exit(1);
            }
            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;
        }
        switch (*(c = ++p) | 040) {
        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);
        case 'f':
            F = (*c == 'F' ? 1 : 0);
            if (*++p || (p = *++av)) {
                fmtp += strlen(fmtp) + 1;
                if (fmtp > fmtbuf + BUFSIZ)
                    error("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 = "";
}

char    *
pad(ip)
struct    openfile    *ip;
{
    register char    *p = ip->sepstring;
    register char    *lp = linep;

    while (*p)
        *lp++ = *p++;
    if (ip->pad) {
        sprintf(lp, ip->format, "");
        lp += strlen(lp);
    }
    return(lp);
}

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

    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));
    }
    p = ip->sepstring;
    while (*p)
        *lp++ = *p++;
    sprintf(lp, ip->format, s);
    lp += strlen(lp);
    return(lp);
}

error(msg, s)
char    *msg;
char    *s;
{
    char    buf[BUFSIZ];

    setbuf(stderr, buf);
    fprintf(stderr, "lam: ");
    fprintf(stderr, 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);
}