readline routine added

+Sean 'Shaleh' Perry <shaleh@debian.org>  Thu,  7 Oct 1999 18:31:57 -0700
+
+  * included my read_a_line() in examples/
+
 Sean 'Shaleh' Perry <shaleh@debian.org>  Wed,  6 Oct 1999 13:55:42 -0700
 Sean 'Shaleh' Perry <shaleh@debian.org>  Wed,  6 Oct 1999 13:55:42 -0700
 
 
   * Cleanup some compilation issues
   * Cleanup some compilation issues

+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef COUNT
+#define COUNT 128 /* safe, middle of the road value */
+#endif
+
+/**
+ * reads a single line from *stream
+ * max line length is max size of size_t
+ * 
+ * PRE: stream is an open FILE stream
+ * POST: returns an allocated string containing the line read, or errno is set
+ *
+ * note, user must free the returned string
+ **/
+char *read_a_line(FILE *stream) {
+
+	char *line = NULL;
+	size_t buffsize = 0; /* counter of alloc'ed space */
+
+	if( feof(stream) ) { /* sent a bum stream */
+		errno = EINVAL;	
+		return NULL;
+	}
+
+	do {
+		if ((line = realloc(line, buffsize + (sizeof(char) * COUNT))) == NULL) {
+			errno = ENOMEM;
+			return NULL;
+		}
+		if( fgets(line + (buffsize ? buffsize - 1 : 0),COUNT,stream) == NULL ) {
+			if( buffsize == 0 ) {
+				errno = EINVAL;
+				return NULL; /* eof w/ nothing read */
+			}
+			break; /* read a line w/o a newline char */
+		}
+		buffsize += COUNT;
+	} while( (strchr(line, '\n')) == NULL );
+
+	return line;
+}

+#ifndef _mailutils_read_a_line__
+#define _mailutils_read_a_line__
+
+char* read_a_line(FILE *stream);
+
+#endif