It was sitting there, in the patches directory, for years. It was delete it

or apply it.  It's small, simple, evil, part of SUSv3, and we can switch it
off.

1 files changed, 1363 insertions, 0 deletions

diff --git a/editors/ed.c b/editors/ed.c
new file mode 100644
index 000000000..0414bfc9d
--- /dev/null
+++ b/editors/ed.c
@@ -0,0 +1,1363 @@
+/*
+ * Copyright (c) 2002 by David I. Bell
+ * Permission is granted to use, distribute, or modify this source,
+ * provided that this copyright notice remains intact.
+ *
+ * The "ed" built-in command (much simplified)
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <memory.h>
+#include <time.h>
+#include <ctype.h>
+#include <sys/param.h>
+#include <malloc.h>
+#include "busybox.h"
+
+#define	USERSIZE	1024	/* max line length typed in by user */
+#define	INITBUF_SIZE	1024	/* initial buffer size */
+typedef struct LINE {
+	struct LINE *next;
+	struct LINE *prev;
+	int len;
+	char data[1];
+} LINE;
+
+static LINE lines, *curLine;
+static int curNum, lastNum, marks[26], dirty;
+static char *bufBase, *bufPtr, *fileName, searchString[USERSIZE];
+static int bufUsed, bufSize;
+
+static void doCommands(void);
+static void subCommand(const char *cmd, int num1, int num2);
+static int getNum(const char **retcp, int *retHaveNum, int *retNum);
+static int setCurNum(int num);
+static int initEdit(void);
+static void termEdit(void);
+static void addLines(int num);
+static int insertLine(int num, const char *data, int len);
+static int deleteLines(int num1, int num2);
+static int printLines(int num1, int num2, int expandFlag);
+static int writeLines(const char *file, int num1, int num2);
+static int readLines(const char *file, int num);
+static int searchLines(const char *str, int num1, int num2);
+static LINE *findLine(int num);
+
+static int findString(const LINE *lp, const char * str, int len, int offset);
+
+int ed_main(int argc, char **argv)
+{
+	if (!initEdit())
+		return EXIT_FAILURE;
+
+	if (argc > 1) {
+		fileName = strdup(argv[1]);
+
+		if (fileName == NULL) {
+			bb_error_msg("No memory");
+			termEdit();
+			return EXIT_SUCCESS;
+		}
+
+		if (!readLines(fileName, 1)) {
+			termEdit();
+			return EXIT_SUCCESS;
+		}
+
+		if (lastNum)
+			setCurNum(1);
+
+		dirty = FALSE;
+	}
+
+	doCommands();
+
+	termEdit();
+	return EXIT_SUCCESS;
+}
+
+/*
+ * Read commands until we are told to stop.
+ */
+static void doCommands(void)
+{
+	const char *cp;
+	char *endbuf, *newname, buf[USERSIZE];
+	int len, num1, num2, have1, have2;
+
+	while (TRUE)
+	{
+		printf(": ");
+		fflush(stdout);
+
+		if (fgets(buf, sizeof(buf), stdin) == NULL)
+			return;
+
+		len = strlen(buf);
+
+		if (len == 0)
+			return;
+
+		endbuf = &buf[len - 1];
+
+		if (*endbuf != '\n')
+		{
+			bb_error_msg("Command line too long");
+
+			do
+			{
+				len = fgetc(stdin);
+			}
+			while ((len != EOF) && (len != '\n'));
+
+			continue;
+		}
+
+		while ((endbuf > buf) && isblank(endbuf[-1]))
+			endbuf--;
+
+		*endbuf = '\0';
+
+		cp = buf;
+
+		while (isblank(*cp))
+			cp++;
+
+		have1 = FALSE;
+		have2 = FALSE;
+
+		if ((curNum == 0) && (lastNum > 0))
+		{
+			curNum = 1;
+			curLine = lines.next;
+		}
+
+		if (!getNum(&cp, &have1, &num1))
+			continue;
+
+		while (isblank(*cp))
+			cp++;
+
+		if (*cp == ',')
+		{
+			cp++;
+
+			if (!getNum(&cp, &have2, &num2))
+				continue;
+
+			if (!have1)
+				num1 = 1;
+
+			if (!have2)
+				num2 = lastNum;
+
+			have1 = TRUE;
+			have2 = TRUE;
+		}
+
+		if (!have1)
+			num1 = curNum;
+
+		if (!have2)
+			num2 = num1;
+
+		switch (*cp++)
+		{
+			case 'a':
+				addLines(num1 + 1);
+				break;
+
+			case 'c':
+				deleteLines(num1, num2);
+				addLines(num1);
+				break;
+
+			case 'd':
+				deleteLines(num1, num2);
+				break;
+
+			case 'f':
+				if (*cp && !isblank(*cp))
+				{
+					bb_error_msg("Bad file command");
+					break;
+				}
+
+				while (isblank(*cp))
+					cp++;
+
+				if (*cp == '\0')
+				{
+					if (fileName)
+						printf("\"%s\"\n", fileName);
+					else
+						printf("No file name\n");
+
+					break;
+				}
+
+				newname = strdup(cp);
+
+				if (newname == NULL)
+				{
+					bb_error_msg("No memory for file name");
+					break;
+				}
+
+				if (fileName)
+					free(fileName);
+
+				fileName = newname;
+				break;
+
+			case 'i':
+				addLines(num1);
+				break;
+
+			case 'k':
+				while (isblank(*cp))
+					cp++;
+
+				if ((*cp < 'a') || (*cp > 'a') || cp[1])
+				{
+					bb_error_msg("Bad mark name");
+					break;
+				}
+
+				marks[*cp - 'a'] = num2;
+				break;
+
+			case 'l':
+				printLines(num1, num2, TRUE);
+				break;
+
+			case 'p':
+				printLines(num1, num2, FALSE);
+				break;
+
+			case 'q':
+				while (isblank(*cp))
+					cp++;
+
+				if (have1 || *cp)
+				{
+					bb_error_msg("Bad quit command");
+					break;
+				}
+
+				if (!dirty)
+					return;
+
+				printf("Really quit? ");
+				fflush(stdout);
+
+				buf[0] = '\0';
+				fgets(buf, sizeof(buf), stdin);
+				cp = buf;
+
+				while (isblank(*cp))
+					cp++;
+
+				if ((*cp == 'y') || (*cp == 'Y'))
+					return;
+
+				break;
+
+			case 'r':
+				if (*cp && !isblank(*cp))
+				{
+					bb_error_msg("Bad read command");
+					break;
+				}
+
+				while (isblank(*cp))
+					cp++;
+
+				if (*cp == '\0')
+				{
+					bb_error_msg("No file name");
+					break;
+				}
+
+				if (!have1)
+					num1 = lastNum;
+
+				if (readLines(cp, num1 + 1))
+					break;
+
+				if (fileName == NULL)
+					fileName = strdup(cp);
+
+				break;
+
+			case 's':
+				subCommand(cp, num1, num2);
+				break;
+
+			case 'w':
+				if (*cp && !isblank(*cp))
+				{
+					bb_error_msg("Bad write command");
+					break;
+				}
+
+				while (isblank(*cp))
+					cp++;
+
+				if (!have1) {
+					num1 = 1;
+					num2 = lastNum;
+				}
+
+				if (*cp == '\0')
+					cp = fileName;
+
+				if (cp == NULL)
+				{
+					bb_error_msg("No file name specified");
+					break;
+				}
+	
+				writeLines(cp, num1, num2);
+				break;
+
+			case 'z':
+				switch (*cp)
+				{
+				case '-':
+					printLines(curNum-21, curNum, FALSE);
+					break;
+				case '.':
+					printLines(curNum-11, curNum+10, FALSE);
+					break;
+				default:
+					printLines(curNum, curNum+21, FALSE);
+					break;
+				}
+				break;
+
+			case '.':
+				if (have1)
+				{
+					bb_error_msg("No arguments allowed");
+					break;
+				}
+
+				printLines(curNum, curNum, FALSE);
+				break;
+	
+			case '-':
+				if (setCurNum(curNum - 1))
+					printLines(curNum, curNum, FALSE);
+
+				break;
+
+			case '=':
+				printf("%d\n", num1);
+				break;
+
+			case '\0':
+				if (have1)
+				{
+					printLines(num2, num2, FALSE);
+					break;
+				}
+
+				if (setCurNum(curNum + 1))
+					printLines(curNum, curNum, FALSE);
+
+				break;
+
+			default:
+				bb_error_msg("Unimplemented command");
+				break;
+		}
+	}
+}
+
+
+/*
+ * Do the substitute command.
+ * The current line is set to the last substitution done.
+ */
+static void subCommand(const char * cmd, int num1, int num2)
+{
+	char *cp, *oldStr, *newStr, buf[USERSIZE];
+	int	delim, oldLen, newLen, deltaLen, offset;
+	LINE *lp, *nlp;
+	int globalFlag, printFlag, didSub, needPrint;
+
+	if ((num1 < 1) || (num2 > lastNum) || (num1 > num2))
+	{
+		bb_error_msg("Bad line range for substitute");
+
+		return;
+	}
+
+	globalFlag = FALSE;
+	printFlag = FALSE;
+	didSub = FALSE;
+	needPrint = FALSE;
+
+	/*
+	 * Copy the command so we can modify it.
+	 */
+	strcpy(buf, cmd);
+	cp = buf;
+
+	if (isblank(*cp) || (*cp == '\0'))
+	{
+		bb_error_msg("Bad delimiter for substitute");
+
+		return;
+	}
+
+	delim = *cp++;
+	oldStr = cp;
+
+	cp = strchr(cp, delim);
+
+	if (cp == NULL)
+	{
+		bb_error_msg("Missing 2nd delimiter for substitute");
+
+		return;
+	}
+
+	*cp++ = '\0';
+
+	newStr = cp;
+	cp = strchr(cp, delim);
+
+	if (cp)
+		*cp++ = '\0';
+	else
+		cp = "";
+
+	while (*cp) switch (*cp++)
+	{
+		case 'g':
+			globalFlag = TRUE;
+			break;
+
+		case 'p':
+			printFlag = TRUE;
+			break;
+
+		default:
+			bb_error_msg("Unknown option for substitute");
+
+			return;
+	}
+
+	if (*oldStr == '\0')
+	{
+		if (searchString[0] == '\0')
+		{
+			bb_error_msg("No previous search string");
+
+			return;
+		}
+
+		oldStr = searchString;
+	}
+
+	if (oldStr != searchString)
+		strcpy(searchString, oldStr);
+
+	lp = findLine(num1);
+
+	if (lp == NULL)
+		return;
+
+	oldLen = strlen(oldStr);
+	newLen = strlen(newStr);
+	deltaLen = newLen - oldLen;
+	offset = 0;
+	nlp = NULL;
+
+	while (num1 <= num2)
+	{
+		offset = findString(lp, oldStr, oldLen, offset);
+
+		if (offset < 0)
+		{
+			if (needPrint)
+			{
+				printLines(num1, num1, FALSE);
+				needPrint = FALSE;
+			}
+
+			offset = 0;
+			lp = lp->next;
+			num1++;
+
+			continue;
+		}
+
+		needPrint = printFlag;
+		didSub = TRUE;
+		dirty = TRUE;
+
+		/*
+		 * If the replacement string is the same size or shorter
+		 * than the old string, then the substitution is easy.
+		 */
+		if (deltaLen <= 0)
+		{
+			memcpy(&lp->data[offset], newStr, newLen);
+
+			if (deltaLen)
+			{
+				memcpy(&lp->data[offset + newLen],
+					&lp->data[offset + oldLen],
+					lp->len - offset - oldLen);
+
+				lp->len += deltaLen;
+			}
+
+			offset += newLen;
+
+			if (globalFlag)
+				continue;
+
+			if (needPrint)
+			{
+				printLines(num1, num1, FALSE);
+				needPrint = FALSE;
+			}
+
+			lp = lp->next;
+			num1++;
+
+			continue;
+		}
+
+		/*
+		 * The new string is larger, so allocate a new line
+		 * structure and use that.  Link it in in place of
+		 * the old line structure.
+		 */
+		nlp = (LINE *) malloc(sizeof(LINE) + lp->len + deltaLen);
+
+		if (nlp == NULL)
+		{
+			bb_error_msg("Cannot get memory for line");
+
+			return;
+		}
+
+		nlp->len = lp->len + deltaLen;
+
+		memcpy(nlp->data, lp->data, offset);
+
+		memcpy(&nlp->data[offset], newStr, newLen);
+
+		memcpy(&nlp->data[offset + newLen],
+			&lp->data[offset + oldLen],
+			lp->len - offset - oldLen);
+
+		nlp->next = lp->next;
+		nlp->prev = lp->prev;
+		nlp->prev->next = nlp;
+		nlp->next->prev = nlp;
+
+		if (curLine == lp)
+			curLine = nlp;
+
+		free(lp);
+		lp = nlp;
+
+		offset += newLen;
+
+		if (globalFlag)
+			continue;
+
+		if (needPrint)
+		{
+			printLines(num1, num1, FALSE);
+			needPrint = FALSE;
+		}
+
+		lp = lp->next;
+		num1++;
+	}
+
+	if (!didSub)
+		bb_error_msg("No substitutions found for \"%s\"", oldStr);
+}
+
+
+/*
+ * Search a line for the specified string starting at the specified
+ * offset in the line.  Returns the offset of the found string, or -1.
+ */
+static int findString( const LINE * lp, const char * str, int len, int offset)
+{
+	int left;
+	const char *cp, *ncp;
+
+	cp = &lp->data[offset];
+	left = lp->len - offset;
+
+	while (left >= len)
+	{
+		ncp = memchr(cp, *str, left);
+
+		if (ncp == NULL)
+			return -1;
+
+		left -= (ncp - cp);
+
+		if (left < len)
+			return -1;
+
+		cp = ncp;
+
+		if (memcmp(cp, str, len) == 0)
+			return (cp - lp->data);
+
+		cp++;
+		left--;
+	}
+
+	return -1;
+}
+
+
+/*
+ * Add lines which are typed in by the user.
+ * The lines are inserted just before the specified line number.
+ * The lines are terminated by a line containing a single dot (ugly!),
+ * or by an end of file.
+ */
+static void addLines(int num)
+{
+	int	len;
+	char	buf[USERSIZE + 1];
+
+	while (fgets(buf, sizeof(buf), stdin))
+	{
+		if ((buf[0] == '.') && (buf[1] == '\n') && (buf[2] == '\0'))
+			return;
+
+		len = strlen(buf);
+
+		if (len == 0)
+			return;
+
+		if (buf[len - 1] != '\n')
+		{
+			bb_error_msg("Line too long");
+
+			do
+			{
+				len = fgetc(stdin);
+			}
+			while ((len != EOF) && (len != '\n'));
+
+			return;
+		}
+
+		if (!insertLine(num++, buf, len))
+			return;
+	}
+}
+
+
+/*
+ * Parse a line number argument if it is present.  This is a sum
+ * or difference of numbers, '.', '$', 'x, or a search string.
+ * Returns TRUE if successful (whether or not there was a number). 
+ * Returns FALSE if there was a parsing error, with a message output.
+ * Whether there was a number is returned indirectly, as is the number.
+ * The character pointer which stopped the scan is also returned.
+ */
+static int getNum(const char **retcp, int *retHaveNum, int *retNum)
+{
+	const char *cp;
+	char *endStr, str[USERSIZE];
+	int haveNum, value, num, sign;
+
+	cp = *retcp;
+	haveNum = FALSE;
+	value = 0;
+	sign = 1;
+
+	while (TRUE)
+	{
+		while (isblank(*cp))
+			cp++;
+
+		switch (*cp)
+		{
+			case '.':
+				haveNum = TRUE;
+				num = curNum;
+				cp++;
+				break;
+
+			case '$':
+				haveNum = TRUE;
+				num = lastNum;
+				cp++;
+				break;
+
+			case '\'':
+				cp++;
+
+				if ((*cp < 'a') || (*cp > 'z'))
+				{
+					bb_error_msg("Bad mark name");
+
+					return FALSE;
+				}
+
+				haveNum = TRUE;
+				num = marks[*cp++ - 'a'];
+				break;
+
+			case '/':
+				strcpy(str, ++cp);
+				endStr = strchr(str, '/');
+
+				if (endStr)
+				{
+					*endStr++ = '\0';
+					cp += (endStr - str);
+				}
+				else
+					cp = "";
+
+				num = searchLines(str, curNum, lastNum);
+
+				if (num == 0)
+					return FALSE;
+
+				haveNum = TRUE;
+				break;
+
+			default:
+				if (!isdigit(*cp))
+				{
+					*retcp = cp;
+					*retHaveNum = haveNum;
+					*retNum = value;
+
+					return TRUE;
+				}
+
+				num = 0;
+
+				while (isdigit(*cp))
+					num = num * 10 + *cp++ - '0';
+
+				haveNum = TRUE;
+				break;
+		}
+
+		value += num * sign;
+
+		while (isblank(*cp))
+			cp++;
+
+		switch (*cp)
+		{
+			case '-':
+				sign = -1;
+				cp++;
+				break;
+
+			case '+':
+				sign = 1;
+				cp++;
+				break;
+
+			default:
+				*retcp = cp;
+				*retHaveNum = haveNum;
+				*retNum = value;
+
+				return TRUE;
+		}
+	}
+}
+
+
+/*
+ * Initialize everything for editing.
+ */
+static int initEdit(void)
+{
+	int	i;
+
+	bufSize = INITBUF_SIZE;
+	bufBase = malloc(bufSize);
+
+	if (bufBase == NULL)
+	{
+		bb_error_msg("No memory for buffer");
+
+		return FALSE;
+	}
+
+	bufPtr = bufBase;
+	bufUsed = 0;
+
+	lines.next = &lines;
+	lines.prev = &lines;
+
+	curLine = NULL;
+	curNum = 0;
+	lastNum = 0;
+	dirty = FALSE;
+	fileName = NULL;
+	searchString[0] = '\0';
+
+	for (i = 0; i < 26; i++)
+		marks[i] = 0;
+
+	return TRUE;
+}
+
+
+/*
+ * Finish editing.
+ */
+static void termEdit(void)
+{
+	if (bufBase)
+		free(bufBase);
+
+	bufBase = NULL;
+	bufPtr = NULL;
+	bufSize = 0;
+	bufUsed = 0;
+
+	if (fileName)
+		free(fileName);
+
+	fileName = NULL;
+
+	searchString[0] = '\0';
+
+	if (lastNum)
+		deleteLines(1, lastNum);
+
+	lastNum = 0;
+	curNum = 0;
+	curLine = NULL;
+}
+
+
+/*
+ * Read lines from a file at the specified line number.
+ * Returns TRUE if the file was successfully read.
+ */
+static int readLines(const char * file, int num)
+{
+	int	fd, cc;
+	int len, lineCount, charCount;
+	char *cp;
+
+	if ((num < 1) || (num > lastNum + 1))
+	{
+		bb_error_msg("Bad line for read");
+
+		return FALSE;
+	}
+
+	fd = open(file, 0);
+
+	if (fd < 0)
+	{
+		perror(file);
+
+		return FALSE;
+	}
+
+	bufPtr = bufBase;
+	bufUsed = 0;
+	lineCount = 0;
+	charCount = 0;
+	cc = 0;
+
+	printf("\"%s\", ", file);
+	fflush(stdout);
+
+	do
+	{
+		cp = memchr(bufPtr, '\n', bufUsed);
+
+		if (cp)
+		{
+			len = (cp - bufPtr) + 1;
+
+			if (!insertLine(num, bufPtr, len))
+			{
+				close(fd);
+
+				return FALSE;
+			}
+
+			bufPtr += len;
+			bufUsed -= len;
+			charCount += len;
+			lineCount++;
+			num++;
+
+			continue;
+		}
+
+		if (bufPtr != bufBase)
+		{
+			memcpy(bufBase, bufPtr, bufUsed);
+			bufPtr = bufBase + bufUsed;
+		}
+
+		if (bufUsed >= bufSize)
+		{
+			len = (bufSize * 3) / 2;
+			cp = realloc(bufBase, len);
+
+			if (cp == NULL)
+			{
+				bb_error_msg("No memory for buffer");
+				close(fd);
+
+				return FALSE;
+			}
+
+			bufBase = cp;
+			bufPtr = bufBase + bufUsed;
+			bufSize = len;
+		}
+
+		cc = read(fd, bufPtr, bufSize - bufUsed);
+		bufUsed += cc;
+		bufPtr = bufBase;
+
+	}
+	while (cc > 0);
+
+	if (cc < 0)
+	{
+		perror(file);
+		close(fd);
+
+		return FALSE;
+	}
+
+	if (bufUsed)
+	{
+		if (!insertLine(num, bufPtr, bufUsed))
+		{
+			close(fd);
+
+			return -1;
+		}
+
+		lineCount++;
+		charCount += bufUsed;
+	}
+
+	close(fd);
+
+	printf("%d lines%s, %d chars\n", lineCount,
+		(bufUsed ? " (incomplete)" : ""), charCount);
+
+	return TRUE;
+}
+
+
+/*
+ * Write the specified lines out to the specified file.
+ * Returns TRUE if successful, or FALSE on an error with a message output.
+ */
+static int writeLines(const char * file, int num1, int num2)
+{
+	LINE *lp;
+	int	fd, lineCount, charCount;
+
+	if ((num1 < 1) || (num2 > lastNum) || (num1 > num2))
+	{
+		bb_error_msg("Bad line range for write");
+
+		return FALSE;
+	}
+
+	lineCount = 0;
+	charCount = 0;
+
+	fd = creat(file, 0666);
+
+	if (fd < 0) {
+		perror(file);
+
+		return FALSE;
+	}
+
+	printf("\"%s\", ", file);
+	fflush(stdout);
+
+	lp = findLine(num1);
+
+	if (lp == NULL)
+	{
+		close(fd);
+
+		return FALSE;
+	}
+
+	while (num1++ <= num2)
+	{
+		if (write(fd, lp->data, lp->len) != lp->len)
+		{
+			perror(file);
+			close(fd);
+
+			return FALSE;
+		}
+
+		charCount += lp->len;
+		lineCount++;
+		lp = lp->next;
+	}
+
+	if (close(fd) < 0)
+	{
+		perror(file);
+
+		return FALSE;
+	}
+
+	printf("%d lines, %d chars\n", lineCount, charCount);
+
+	return TRUE;
+}
+
+
+/*
+ * Print lines in a specified range.
+ * The last line printed becomes the current line.
+ * If expandFlag is TRUE, then the line is printed specially to
+ * show magic characters.
+ */
+static int printLines(int num1, int num2, int expandFlag)
+{
+	const LINE *lp;
+	const char *cp;
+	int ch, count;
+
+	if ((num1 < 1) || (num2 > lastNum) || (num1 > num2))
+	{
+		bb_error_msg("Bad line range for print");
+
+		return FALSE;
+	}
+
+	lp = findLine(num1);
+
+	if (lp == NULL)
+		return FALSE;
+
+	while (num1 <= num2)
+	{
+		if (!expandFlag)
+		{
+			write(1, lp->data, lp->len);
+			setCurNum(num1++);
+			lp = lp->next;
+
+			continue;
+		}
+
+		/*
+		 * Show control characters and characters with the
+		 * high bit set specially.
+		 */
+		cp = lp->data;
+		count = lp->len;
+
+		if ((count > 0) && (cp[count - 1] == '\n'))
+			count--;
+
+		while (count-- > 0)
+		{
+			ch = *cp++;
+
+			if (ch & 0x80)
+			{
+				fputs("M-", stdout);
+				ch &= 0x7f;
+			}
+
+			if (ch < ' ')
+			{
+				fputc('^', stdout);
+				ch += '@';
+			}
+
+			if (ch == 0x7f)
+			{
+				fputc('^', stdout);
+				ch = '?';
+			}
+
+			fputc(ch, stdout);
+		}
+
+		fputs("$\n", stdout);
+
+		setCurNum(num1++);
+		lp = lp->next;
+	}
+
+	return TRUE;
+}
+
+
+/*
+ * Insert a new line with the specified text.
+ * The line is inserted so as to become the specified line,
+ * thus pushing any existing and further lines down one.
+ * The inserted line is also set to become the current line.
+ * Returns TRUE if successful.
+ */
+static int insertLine(int num, const char * data, int len)
+{
+	LINE *newLp, *lp;
+
+	if ((num < 1) || (num > lastNum + 1))
+	{
+		bb_error_msg("Inserting at bad line number");
+
+		return FALSE;
+	}
+
+	newLp = (LINE *) malloc(sizeof(LINE) + len - 1);
+
+	if (newLp == NULL) 
+	{
+		bb_error_msg("Failed to allocate memory for line");
+
+		return FALSE;
+	}
+
+	memcpy(newLp->data, data, len);
+	newLp->len = len;
+
+	if (num > lastNum)
+		lp = &lines;
+	else
+	{
+		lp = findLine(num);
+
+		if (lp == NULL)
+		{
+			free((char *) newLp);
+
+			return FALSE;
+		}
+	}
+
+	newLp->next = lp;
+	newLp->prev = lp->prev;
+	lp->prev->next = newLp;
+	lp->prev = newLp;
+
+	lastNum++;
+	dirty = TRUE;
+
+	return setCurNum(num);
+}
+
+
+/*
+ * Delete lines from the given range.
+ */
+static int deleteLines(int num1, int num2)
+{
+	LINE *lp, *nlp, *plp;
+	int count;
+
+	if ((num1 < 1) || (num2 > lastNum) || (num1 > num2))
+	{
+		bb_error_msg("Bad line numbers for delete");
+
+		return FALSE;
+	}
+
+	lp = findLine(num1);
+
+	if (lp == NULL)
+		return FALSE;
+
+	if ((curNum >= num1) && (curNum <= num2))
+	{
+		if (num2 < lastNum)
+			setCurNum(num2 + 1);
+		else if (num1 > 1)
+			setCurNum(num1 - 1);
+		else
+			curNum = 0;
+	}
+
+	count = num2 - num1 + 1;
+
+	if (curNum > num2)
+		curNum -= count;
+
+	lastNum -= count;
+
+	while (count-- > 0)
+	{
+		nlp = lp->next;
+		plp = lp->prev;
+		plp->next = nlp;
+		nlp->prev = plp;
+		lp->next = NULL;
+		lp->prev = NULL;
+		lp->len = 0;
+		free(lp);
+		lp = nlp;
+	}
+
+	dirty = TRUE;
+
+	return TRUE;
+}
+
+
+/*
+ * Search for a line which contains the specified string.
+ * If the string is NULL, then the previously searched for string
+ * is used.  The currently searched for string is saved for future use.
+ * Returns the line number which matches, or 0 if there was no match
+ * with an error printed.
+ */
+static int searchLines(const char *str, int num1, int num2)
+{
+	const LINE *lp;
+	int len;
+
+	if ((num1 < 1) || (num2 > lastNum) || (num1 > num2))
+	{
+		bb_error_msg("Bad line numbers for search");
+
+		return 0;
+	}
+
+	if (*str == '\0')
+	{
+		if (searchString[0] == '\0')
+		{
+			bb_error_msg("No previous search string");
+
+			return 0;
+		}
+
+		str = searchString;
+	}
+
+	if (str != searchString)
+		strcpy(searchString, str);
+
+	len = strlen(str);
+
+	lp = findLine(num1);
+
+	if (lp == NULL)
+		return 0;
+
+	while (num1 <= num2)
+	{
+		if (findString(lp, str, len, 0) >= 0)
+			return num1;
+
+		num1++;
+		lp = lp->next;
+	}
+
+	bb_error_msg("Cannot find string \"%s\"", str);
+
+	return 0;
+}
+
+
+/*
+ * Return a pointer to the specified line number.
+ */
+static LINE *findLine(int num)
+{
+	LINE *lp;
+	int lnum;
+
+	if ((num < 1) || (num > lastNum))
+	{
+		bb_error_msg("Line number %d does not exist", num);
+
+		return NULL;
+	}
+
+	if (curNum <= 0)
+	{
+		curNum = 1;
+		curLine = lines.next;
+	}
+
+	if (num == curNum)
+		return curLine;
+
+	lp = curLine;
+	lnum = curNum;
+
+	if (num < (curNum / 2))
+	{
+		lp = lines.next;
+		lnum = 1;
+	}
+	else if (num > ((curNum + lastNum) / 2))
+	{
+		lp = lines.prev;
+		lnum = lastNum;
+	}
+
+	while (lnum < num)
+	{
+		lp = lp->next;
+		lnum++;
+	}
+
+	while (lnum > num)
+	{
+		lp = lp->prev;
+		lnum--;
+	}
+
+	return lp;
+}
+
+
+/*
+ * Set the current line number.
+ * Returns TRUE if successful.
+ */
+static int setCurNum(int num)
+{
+	LINE *lp;
+
+	lp = findLine(num);
+
+	if (lp == NULL)
+		return FALSE;
+
+	curNum = num;
+	curLine = lp;
+
+	return TRUE;
+}