--- ray/src/common/header.c	1989/02/02 10:34:33	1.1
+++ ray/src/common/header.c	1997/10/31 11:40:52	2.9
@@ -1,4 +1,4 @@
-/* Copyright (c) 1988 Regents of the University of California */
+/* Copyright (c) 1996 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -8,61 +8,242 @@ static char SCCSid[] = "$SunId$ LBL";
  *  header.c - routines for reading and writing information headers.
  *
  *	8/19/88
+ *
+ *  newheader(t,fp)	start new information header identified by string t
+ *  isheadid(s)		returns true if s is a header id line
+ *  headidval(r,s)	copy header identifier value in s to r
+ *  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
+ *  globmatch(pat, str)	check for glob match of str against pat
+ *  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  HDRSTR[] = "#?";		/* information header magic number */
+
+char  FMTSTR[] = "FORMAT=";	/* format identifier */
+
+
+newheader(s, fp)		/* identifying line of information header */
+char  *s;
+register FILE  *fp;
+{
+	fputs(HDRSTR, fp);
+	fputs(s, fp);
+	putc('\n', fp);
+}
+
+
+int
+headidval(r,s)			/* get header id (return true if is id) */
+register char  *r, *s;
+{
+	register char  *cp = HDRSTR;
+
+	while (*cp) if (*cp++ != *s++) return(0);
+	if (r == NULL) return(1);
+	while (*s && !isspace(*s)) *r++ = *s++;
+	*r = '\0';
+	return(1);
+}
+
+
+int
+isheadid(s)			/* check to see if line is header id */
+char  *s;
+{
+	return(headidval(NULL, s));
+}
+
+
 printargs(ac, av, fp)		/* print arguments to a file */
 int  ac;
 char  **av;
-FILE  *fp;
+register FILE  *fp;
 {
+	int  quote;
+
 	while (ac-- > 0) {
-		fputs(*av++, fp);
-		putc(' ', fp);
+		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(ac ? ' ' : '\n', fp);
 	}
-	putc('\n', fp);
 }
 
 
-#define  MAXLINE	512
+int
+formatval(r, s)			/* get format value (return true if format) */
+register char  *r;
+register char  *s;
+{
+	register char  *cp = FMTSTR;
 
-getheader(fp, f)		/* get header from file */
+	while (*cp) if (*cp++ != *s++) return(0);
+	while (isspace(*s)) s++;
+	if (!*s) return(0);
+	if (r == NULL) return(1);
+	do
+		*r++ = *s++;
+	while(*s && !isspace(*s));
+	*r = '\0';
+	return(1);
+}
+
+
+int
+isformat(s)			/* is line a format line? */
+char  *s;
+{
+	return(formatval(NULL, s));
+}
+
+
+fputformat(s, fp)		/* put out a format value */
+char  *s;
 FILE  *fp;
+{
+	fputs(FMTSTR, fp);
+	fputs(s, fp);
+	putc('\n', fp);
+}
+
+
+int
+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)
+		if (fgets(buf, MAXLINE, fp) == NULL)
 			return(-1);
 		if (buf[0] == '\n')
 			return(0);
+#ifdef MSDOS
+		if (buf[0] == '\r' && buf[1] == '\n')
+			return(0);
+#endif
 		if (buf[MAXLINE-2] != '\n') {
 			ungetc(buf[MAXLINE-2], fp);	/* prevent false end */
 			buf[MAXLINE-2] = '\0';
 		}
 		if (f != NULL)
-			(*f)(buf);
+			(*f)(buf, p);
 	}
 }
 
 
-static FILE	*outfp;
+struct check {
+	FILE	*fp;
+	char	fs[64];
+};
 
+
 static
-myputs(s)
+mycheck(s, cp)			/* check a header line for format info. */
 char  *s;
+register struct check  *cp;
 {
-	fputs(s, outfp);
+	if (!formatval(cp->fs, s) && cp->fp != NULL)
+		fputs(s, cp->fp);
 }
 
 
-copyheader(fin, fout)		/* copy file header */
-FILE  *fin, *fout;
+int
+globmatch(pat, str)		/* check for glob match of str against pat */
+char	*pat, *str;
 {
-	outfp = fout;
-	return(getheader(fin, myputs));
+	register char	*p = pat, *s = str;
+
+	do {
+		switch (*p) {
+		case '?':			/* match any character */
+			if (!*s++)
+				return(0);
+			break;
+		case '*':			/* match any string */
+			while (p[1] == '*') p++;
+			do
+				if ( (p[1]=='?' || p[1]==*s) &&
+						globmatch(p+1,s) )
+					return(1);
+			while (*s++);
+			return(0);
+		case '\\':			/* literal next */
+			p++;
+		/* fall through */
+		default:			/* normal character */
+			if (*p != *s)
+				return(0);
+			s++;
+			break;
+		}
+	} while (*p++);
+	return(1);
+}
+
+
+/*
+ * 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,
+ * and that it is not a static, read-only string!
+ * The input header (minus any format lines) is copied to fout
+ * if fout is not NULL.
+ */
+
+int
+checkheader(fin, fmt, fout)
+FILE  *fin;
+char  *fmt;
+FILE  *fout;
+{
+	struct check	cdat;
+	register char	*cp;
+
+	cdat.fp = fout;
+	cdat.fs[0] = '\0';
+	if (getheader(fin, mycheck, &cdat) < 0)
+		return(-1);
+	if (!cdat.fs[0])
+		return(0);
+	for (cp = fmt; *cp; cp++)		/* check for globbing */
+		if (*cp == '?' | *cp == '*')
+			if (globmatch(fmt, cdat.fs)) {
+				strcpy(fmt, cdat.fs);
+				return(1);
+			} else
+				return(-1);
+	return(strcmp(fmt, cdat.fs) ? -1 : 1);	/* literal match */
 }