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Parser/myreadline.c

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+/***********************************************************
+Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
+Amsterdam, The Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Readline interface for tokenizer.c.
+   By default, we have a super simple my_readline function.
+   Optionally, we can use the GNU readline library (to be found in the
+   bash distribution).
+   my_readline() has a different return value from GNU readline():
+   - NULL if an interrupt occurred or if an error occurred
+   - a malloc'ed empty string if EOF was read
+   - a malloc'ed string ending in \n normally
+*/
+
+#include <stdio.h>
+#include <string.h>
+
+#include "mymalloc.h"
+
+#ifdef HAVE_READLINE
+
+extern char *readline();
+
+#include <setjmp.h>
+#include <signal.h>
+
+static jmp_buf jbuf;
+
+/* ARGSUSED */
+static RETSIGTYPE
+onintr(sig)
+	int sig;
+{
+	longjmp(jbuf, 1);
+}
+
+#endif /* HAVE_READLINE */
+
+char *
+my_readline(prompt)
+	char *prompt;
+{
+	int n;
+	char *p;
+#ifdef HAVE_READLINE
+	RETSIGTYPE (*old_inthandler)();
+	static int been_here;
+	if (!been_here) {
+		/* Force rebind of TAB to insert-tab */
+		extern int rl_insert();
+		rl_bind_key('\t', rl_insert);
+		been_here++;
+	}
+	old_inthandler = signal(SIGINT, onintr);
+	if (setjmp(jbuf)) {
+		signal(SIGINT, old_inthandler);
+		return NULL;
+	}
+	p = readline(prompt);
+	signal(SIGINT, old_inthandler);
+	if (p == NULL) {
+		p = malloc(1);
+		if (p != NULL)
+			*p = '\0';
+		return p;
+	}
+	n = strlen(p);
+	if (n > 0)
+		add_history(p);
+	if ((p = realloc(p, n+2)) != NULL) {
+		p[n] = '\n';
+		p[n+1] = '\0';
+	}
+	return p;
+#else /* !HAVE_READLINE */
+	n = 100;
+	if ((p = malloc(n)) == NULL)
+		return NULL;
+	if (prompt)
+		fprintf(stderr, "%s", prompt);
+	if (fgets(p, n, stdin) == NULL)
+		    *p = '\0';
+	if (intrcheck()) {
+		free(p);
+		return NULL;
+	}
+	n = strlen(p);
+	while (n > 0 && p[n-1] != '\n') {
+		int incr = n+2;
+		p = realloc(p, n + incr);
+		if (p == NULL)
+			return NULL;
+		if (fgets(p+n, incr, stdin) == NULL)
+			break;
+		n += strlen(p+n);
+	}
+	return realloc(p, n+1);
+#endif /* !HAVE_READLINE */
+}