From 3b89039c25c8eb15435ed4f87bc8cb31c7941064 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Thu, 4 May 2006 20:56:43 +0000
Subject: 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.
---
editors/Config.in | 8 +
editors/Makefile.in | 5 +-
editors/ed.c | 1363 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1374 insertions(+), 2 deletions(-)
create mode 100644 editors/ed.c
(limited to 'editors')
diff --git a/editors/Config.in b/editors/Config.in
index a30879c63..14c316c08 100644
--- a/editors/Config.in
+++ b/editors/Config.in
@@ -20,6 +20,14 @@ config CONFIG_FEATURE_AWK_MATH
Enable math functions of the Awk programming language.
NOTE: This will require libm to be present for linking.
+config CONFIG_ED
+ bool "ed"
+ default n
+ help
+ The original 1970's Unix text editor, from the days of teletypes.
+ Small, simple, evil. Part of SUSv3. If you're not already using
+ this, you don't need it.
+
config CONFIG_PATCH
bool "patch"
default n
diff --git a/editors/Makefile.in b/editors/Makefile.in
index 805017dcc..9a46e32c2 100644
--- a/editors/Makefile.in
+++ b/editors/Makefile.in
@@ -11,8 +11,9 @@ endif
srcdir=$(top_srcdir)/editors
EDITOR-y:=
-EDITOR-$(CONFIG_AWK) += awk.o
-EDITOR-$(CONFIG_PATCH) += patch.o
+EDITOR-$(CONFIG_AWK) += awk.o
+EDITOR-$(CONFIG_ED) += ed.o
+EDITOR-$(CONFIG_PATCH) += patch.o
EDITOR-$(CONFIG_SED) += sed.o
EDITOR-$(CONFIG_VI) += vi.o
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;
+}
--
cgit v1.2.3