* add readline()

* add fatal()

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3523 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/libc/readline.c

@@ -0,0 +1,150 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 coresystems GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+
+static char * readline_buffer;
+static int readline_bufferlen;
+
+/**
+ * This readline implementation is rather simple, but it does more than the
+ * original readline() because it allows us to have a pre-filled buffer. To
+ * pre-fill the buffer, use the getline() function.
+ */
+char * readline(const char * prompt)
+{
+	char *buffer;
+	int current, ch, nonspace_seen;
+
+	if (!readline_buffer || !readline_bufferlen) {
+#define READLINE_BUFFERSIZE	256
+		readline_buffer = malloc(READLINE_BUFFERSIZE);
+		readline_bufferlen = READLINE_BUFFERSIZE;
+		memset(readline_buffer, 0, readline_bufferlen);
+	}
+
+	buffer = readline_buffer;
+	
+	/* print prompt */
+	if (prompt) {
+		current = 0;
+		while (prompt[current]) {
+			putchar(prompt[current]);
+			current++;
+		}
+	}
+
+	/* print existing buffer, if there is one */
+	current = 0;
+	while (buffer[current]) {
+		putchar(buffer[current]);
+		current++;
+	}
+
+	while (1) {
+		ch = getchar();
+		switch (ch) {
+		case '\r':
+		case '\n':
+			/* newline */
+			putchar('\n');
+			goto out;
+		case '\b':
+		case '\x7f':
+			/* backspace */
+			if (current > 0) {
+				putchar('\b');
+				putchar(' ');
+				putchar('\b');
+				current--;
+			}
+			break;
+		case 'W' & 0x1f:	/* CTRL-W */
+			/* word erase */
+			nonspace_seen = 0;
+			while (current) {
+				if (buffer[current - 1] != ' ')
+					nonspace_seen = 1;
+				putchar('\b');
+				putchar(' ');
+				putchar('\b');
+				current--;
+				if (nonspace_seen && (current < readline_bufferlen - 1)
+				    && (current > 0) && (buffer[current - 1] == ' '))
+					break;
+			}
+			break;
+		case 'U' & 0x1f:	/* CTRL-U */
+			/* line erase */
+			while (current) {
+				putchar('\b');
+				putchar(' ');
+				putchar('\b');
+				current--;
+			}
+			current = 0;
+			break;
+		default:
+			/* all other characters */
+
+			/* ignore control characters */
+			if (ch < 0x20)
+				break;
+
+			/* ignore unprintables */
+			if (ch >= 0x7f)
+				break;
+
+			if (current + 1 < readline_bufferlen) {
+				/* print new character */
+				putchar(ch);
+				/* and add it to the array */
+				buffer[current] = ch;
+				current++;
+			}
+		}
+	}
+
+
+out:
+	if (current >= readline_bufferlen)
+		current = readline_bufferlen - 1;
+	buffer[current] = '\0';
+
+	return buffer;
+}
+
+int getline(char *buffer, int len)
+{
+	readline_buffer = buffer;
+	readline_bufferlen = len;
+	readline(NULL);
+	return strlen(buffer);
+}
+