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/* Copyright (c) 1988 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* header.c - routines for reading and writing information headers.
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*
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* 8/19/88
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*
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* printargs(ac,av,fp) print an argument list to fp, followed by '\n'
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* isformat(s) returns true if s is of the form "FORMAT=*"
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* formatval(r,s) copy the format value in s to r
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* fputformat(s,fp) write "FORMAT=%s" to fp
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* getheader(fp,f,p) read header from fp, calling f(s,p) on each line
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* checkheader(i,p,o) check header format from i against p and copy to o
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*
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* To copy header from input to output, use getheader(fin, fputs, fout)
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*/
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#include <stdio.h>
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#include <ctype.h>
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#define MAXLINE 512
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char FMTSTR[] = "FORMAT=";
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int FMTSTRL = 7;
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printargs(ac, av, fp) /* print arguments to a file */
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int ac;
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char **av;
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FILE *fp;
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{
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while (ac-- > 0) {
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fputs(*av++, fp);
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putc(' ', fp);
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}
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putc('\n', fp);
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}
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isformat(s) /* is line a format line? */
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char *s;
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{
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return(!strncmp(s,FMTSTR,FMTSTRL));
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}
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formatval(r, s) /* return format value */
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register char *r;
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register char *s;
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{
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s += FMTSTRL;
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while (isspace(*s)) s++;
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if (!*s) { *r = '\0'; return; }
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while(*s) *r++ = *s++;
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while (isspace(r[-1])) r--;
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*r = '\0';
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}
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fputformat(s, fp) /* put out a format value */
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char *s;
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FILE *fp;
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{
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fputs(FMTSTR, fp);
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fputs(s, fp);
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putc('\n', fp);
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}
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getheader(fp, f, p) /* get header from file */
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FILE *fp;
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int (*f)();
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char *p;
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{
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char buf[MAXLINE];
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for ( ; ; ) {
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buf[MAXLINE-2] = '\n';
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if (fgets(buf, sizeof(buf), fp) == NULL)
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return(-1);
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if (buf[0] == '\n')
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return(0);
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if (buf[MAXLINE-2] != '\n') {
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ungetc(buf[MAXLINE-2], fp); /* prevent false end */
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buf[MAXLINE-2] = '\0';
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}
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if (f != NULL)
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(*f)(buf, p);
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}
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}
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struct check {
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FILE *fp;
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char fs[64];
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};
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static
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mycheck(s, cp) /* check a header line for format info. */
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char *s;
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register struct check *cp;
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{
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if (!strncmp(s,FMTSTR,FMTSTRL))
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formatval(cp->fs, s);
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else if (cp->fp != NULL) /* don't copy format info. */
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fputs(s, cp->fp);
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}
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/*
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* Copymatch(pat,str) checks pat for wildcards, and
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* copies str into pat if there is a match (returning true).
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*/
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#ifdef COPYMATCH
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copymatch(pat, str)
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char *pat, *str;
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{
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int docopy = 0;
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register char *p = pat, *s = str;
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do {
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switch (*p) {
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case '?': /* match any character */
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if (!*s++)
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return(0);
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docopy++;
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break;
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case '*': /* match any string */
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while (p[1] == '*') p++;
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do
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if ( (p[1] == '?' || p[1] == *s)
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&& copymatch(p+1,s) ) {
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strcpy(pat, str);
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return(1);
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}
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while (*s++);
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return(0);
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case '\\': /* literal next */
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p++;
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/* fall through */
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default: /* normal character */
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if (*p != *s)
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return(0);
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s++;
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break;
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}
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} while (*p++);
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if (docopy)
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strcpy(pat, str);
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return(1);
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}
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#else
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#define copymatch(pat, s) (!strcmp(pat, s))
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#endif
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/*
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* Checkheader(fin,fmt,fout) returns a value of 1 if the input format
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* matches the specification in fmt, 0 if no input format was found,
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* and -1 if the input format does not match or there is an
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* error reading the header. If fmt is NULL, then -1 is returned
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* if any input format is found (or there is an error), and 0 otherwise.
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* If fmt contains any '*' or '?' characters, then checkheader
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* does wildcard expansion and copies a matching result into fmt.
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* Be sure that fmt is big enough to hold the match in such cases!
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* The input header (minus any format lines) is copied to fout
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* if fout is not NULL.
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*/
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checkheader(fin, fmt, fout)
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FILE *fin;
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char *fmt;
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FILE *fout;
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{
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struct check cdat;
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cdat.fp = fout;
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cdat.fs[0] = '\0';
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if (getheader(fin, mycheck, &cdat) < 0)
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return(-1);
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if (fmt == NULL && cdat.fs[0] != '\0')
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return(-1);
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if (cdat.fs[0] != '\0')
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return(copymatch(fmt, cdat.fs) ? 1 : -1);
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return(0);
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}
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