DP Tool Club 8/CDASC08.ISO/NEWS/RADIANCE/SRC/COMMON/HEADER.C

C/C++ Source or Header | 1993-10-07 | 5KB | 208 lines

/* Copyright (c) 1991 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "@(#)header.c 2.2 2/20/92 LBL";
#endif

/*
 *  header.c - routines for reading and writing information headers.
 *
 *      8/19/88
 *
 *  printargs(ac,av,fp) print an argument list to fp, followed by '\n'
 *  isformat(s)         returns true if s is of the form "FORMAT=*"
 *  formatval(r,s)      copy the format value in s to r
 *  fputformat(s,fp)    write "FORMAT=%s" to fp
 *  getheader(fp,f,p)   read header from fp, calling f(s,p) on each line
 *  checkheader(i,p,o)  check header format from i against p and copy to o
 *
 *  To copy header from input to output, use getheader(fin, fputs, fout)
 */

#include  <stdio.h>
#include  <ctype.h>

#define  MAXLINE        512

#ifndef BSD
#define  index  strchr
#endif

extern char  *index();

char  FMTSTR[] = "FORMAT=";
int  FMTSTRL = 7;


printargs(ac, av, fp)           /* print arguments to a file */
int  ac;
char  **av;
register FILE  *fp;
{
    int  quote;

    while (ac-- > 0) {
        if (index(*av, ' ') != NULL) {          /* quote it */
            if (index(*av, '\'') != NULL)
                quote = '"';
            else
                quote = '\'';
            putc(quote, fp);
            fputs(*av++, fp);
            putc(quote, fp);
        } else
            fputs(*av++, fp);
        putc(' ', fp);
    }
    putc('\n', fp);
}


isformat(s)                     /* is line a format line? */
char  *s;
{
    return(!strncmp(s,FMTSTR,FMTSTRL));
}


formatval(r, s)                 /* return format value */
register char  *r;
register char  *s;
{
    s += FMTSTRL;
    while (isspace(*s)) s++;
    if (!*s) { *r = '\0'; return; }
    while(*s) *r++ = *s++;
    while (isspace(r[-1])) r--;
    *r = '\0';
}


fputformat(s, fp)               /* put out a format value */
char  *s;
FILE  *fp;
{
    fputs(FMTSTR, fp);
    fputs(s, fp);
    putc('\n', fp);
}


getheader(fp, f, p)             /* get header from file */
FILE  *fp;
int  (*f)();
char  *p;
{
    char  buf[MAXLINE];

    for ( ; ; ) {
        buf[MAXLINE-2] = '\n';
        if (fgets(buf, sizeof(buf), fp) == NULL)
            return(-1);
        if (buf[0] == '\n')
            return(0);
        if (buf[MAXLINE-2] != '\n') {
            ungetc(buf[MAXLINE-2], fp);     /* prevent false end */
            buf[MAXLINE-2] = '\0';
        }
        if (f != NULL)
            (*f)(buf, p);
    }
}


struct check {
    FILE    *fp;
    char    fs[64];
};


static
mycheck(s, cp)                  /* check a header line for format info. */
char  *s;
register struct check  *cp;
{
    if (!strncmp(s,FMTSTR,FMTSTRL))
        formatval(cp->fs, s);
    else if (cp->fp != NULL)        /* don't copy format info. */
        fputs(s, cp->fp);
}


/*
 * Copymatch(pat,str) checks pat for wildcards, and
 * copies str into pat if there is a match (returning true).
 */

#ifdef COPYMATCH
copymatch(pat, str)
char    *pat, *str;
{
    int     docopy = 0;
    register char   *p = pat, *s = str;

    do {
        switch (*p) {
        case '?':                       /* match any character */
            if (!*s++)
                return(0);
            docopy++;
            break;
        case '*':                       /* match any string */
            while (p[1] == '*') p++;
            do
                if ( (p[1]=='?' || p[1]==*s)
                        && copymatch(p+1,s) ) {
                    strcpy(pat, str);
                    return(1);
                }
            while (*s++);
            return(0);
        case '\\':                      /* literal next */
            p++;
        /* fall through */
        default:                        /* normal character */
            if (*p != *s)
                return(0);
            s++;
            break;
        }
    } while (*p++);
    if (docopy)
        strcpy(pat, str);
    return(1);
}
#else
#define copymatch(pat, s)       (!strcmp(pat, s))
#endif


/*
 * Checkheader(fin,fmt,fout) returns a value of 1 if the input format
 * matches the specification in fmt, 0 if no input format was found,
 * and -1 if the input format does not match or there is an
 * error reading the header.  If fmt is empty, then -1 is returned
 * if any input format is found (or there is an error), and 0 otherwise.
 * If fmt contains any '*' or '?' characters, then checkheader
 * does wildcard expansion and copies a matching result into fmt.
 * Be sure that fmt is big enough to hold the match in such cases!
 * The input header (minus any format lines) is copied to fout
 * if fout is not NULL.
 */

checkheader(fin, fmt, fout)
FILE  *fin;
char  *fmt;
FILE  *fout;
{
    struct check    cdat;

    cdat.fp = fout;
    cdat.fs[0] = '\0';
    if (getheader(fin, mycheck, &cdat) < 0)
        return(-1);
    if (cdat.fs[0] != '\0')
        return(copymatch(fmt, cdat.fs) ? 1 : -1);
    return(0);
}