Initial commit

lib/misc/fgetln.c

@@ -0,0 +1,108 @@
+/*
+ * $QNXLicenseC:
+ * Copyright 2007, QNX Software Systems. All Rights Reserved.
+ * 
+ * You must obtain a written license from and pay applicable license fees to QNX 
+ * Software Systems before you may reproduce, modify or distribute this software, 
+ * or any work that includes all or part of this software.   Free development 
+ * licenses are available for evaluation and non-commercial purposes.  For more 
+ * information visit http://licensing.qnx.com or email licensing@qnx.com.
+ *  
+ * This file may contain contributions from others.  Please review this entire 
+ * file for other proprietary rights or license notices, as well as the QNX 
+ * Development Suite License Guide at http://licensing.qnx.com/license-guide/ 
+ * for other information.
+ * $
+ */
+
+
+
+
+
+#include <malloc.h>
+#include <stdio.h>
+#include <util.h>
+
+static char *__fgl_line;
+static size_t __fgl_bufsize;
+
+char *
+fgetln_r(FILE *stream, size_t *lenp, char **bufp, size_t *buflenp)
+{
+	int base_size, p_size, len_tot, ndone; 
+	char *base, *p;
+	off_t pos_prev, pos_cur;
+	char *temp;
+
+	if (bufp == NULL) {
+		bufp = &__fgl_line;
+		buflenp = &__fgl_bufsize;
+	}
+
+	base = *bufp;
+	base_size = *buflenp;
+
+	p = base;
+	len_tot = 0;
+
+	flockfile(stream);
+
+	pos_prev = ftello(stream);
+
+	for (;;) {
+		/*
+		 * fgets add a '\0'.
+		 * Need signed comparison for first time through.
+		 */
+		if (len_tot >= base_size - 1) {
+			/* need more room */
+			if ((temp = realloc(base, base_size + BUFSIZ)) == NULL) {
+				len_tot = 0;
+				break;
+			}
+
+			base = temp;
+			base_size += BUFSIZ;
+		}
+
+		p = base + len_tot;
+		p_size = base + base_size - p;
+
+		if (fgets(p, p_size, stream) == NULL)
+			break;
+
+		pos_cur = ftello(stream);
+
+		ndone = pos_cur - pos_prev;
+		pos_prev = pos_cur;
+
+		len_tot += ndone;
+
+		/*
+		 * checking for eof avoids an unecessary realloc()
+		 * in the high runner case: more often file will end 
+		 * without a newline than it will have lines longer
+		 * than BUFSIZ,
+		 */
+		if (p[ndone - 1] == '\n' || feof(stream))
+			break;
+	} 
+
+	funlockfile(stream);
+
+	*bufp = base;
+	*buflenp = base_size;
+		
+	if (len_tot) {
+		*lenp = len_tot;
+		return (base);
+	}
+
+	return (NULL);
+}
+
+char *
+fgetln(FILE *stream, size_t *len)
+{
+	return (fgetln_r(stream, len, NULL, NULL));
+}