src/common/fgetline.c

#ifndef lint
static const char       RCSid[] = "$Id: fgetline.c,v 2.5 2004/02/11 22:11:33 greg Exp $";
#endif
/*
 * fgetline.c - read line with escaped newlines.
 *
 *  External symbols declared in rtio.h
 */

#include "copyright.h"

#include  "rtio.h"

#ifdef getc_unlocked            /* avoid horrendous overhead of flockfile */
#define getc    getc_unlocked
#endif


char *
fgetline(s, n, fp)      /* read in line with escapes, elide final newline */
char  *s;
int  n;
register FILE  *fp;
{
        register char  *cp = s;
        register int  c = EOF;

        while (--n > 0 && (c = getc(fp)) != EOF) {
                if (c == '\r' && (c = getc(fp)) != '\n') {
                        ungetc(c, fp);          /* must be Apple file */
                        c = '\n';
                }
                if (c == '\n' && (cp == s || cp[-1] != '\\'))
                        break;
                *cp++ = c;
        }
        if (cp == s && c == EOF)
                return(NULL);
        *cp = '\0';
        return(s);
}
Revision:	2.6
Committed:	Thu Apr 29 14:36:49 2004 UTC (20 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.5:	+5 -1 lines
Log Message:	Added macros to avoid flockfile(3) overhead
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.6	static const char RCSid[] = "$Id: fgetline.c,v 2.5 2004/02/11 22:11:33 greg Exp $";
3	greg	1.1	#endif
4			/*
5	greg	1.2	* fgetline.c - read line with escaped newlines.
6	greg	1.1	*
7	greg	2.4	* External symbols declared in rtio.h
8	greg	2.2	*/
9
10	greg	2.3	#include "copyright.h"
11	greg	1.1
12	greg	2.4	#include "rtio.h"
13	greg	1.1
14	greg	2.6	#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */
15			#define getc getc_unlocked
16			#endif
17
18	greg	1.1
19			char *
20			fgetline(s, n, fp) /* read in line with escapes, elide final newline */
21			char *s;
22	greg	1.2	int n;
23			register FILE *fp;
24	greg	1.1	{
25	greg	1.2	register char *cp = s;
26			register int c = EOF;
27	greg	1.1
28	greg	1.2	while (--n > 0 && (c = getc(fp)) != EOF) {
29	greg	2.5	if (c == '\r' && (c = getc(fp)) != '\n') {
30			ungetc(c, fp); /* must be Apple file */
31			c = '\n';
32			}
33	greg	1.2	if (c == '\n' && (cp == s \|\| cp[-1] != '\\'))
34			break;
35	greg	1.1	*cp++ = c;
36			}
37	greg	1.2	if (cp == s && c == EOF)
38	greg	1.1	return(NULL);
39	greg	1.2	*cp = '\0';
40	greg	1.1	return(s);
41			}