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#include <R_ext/Boolean.h>#include <R_ext/Error.h>/** Copyright (C) 1991, 1992, 1993 by Chris Thewalt (thewalt@ce.berkeley.edu)** Permission to use, copy, modify, and distribute this software* for any purpose and without fee is hereby granted, provided* that the above copyright notices appear in all copies and that both the* copyright notice and this permission notice appear in supporting* documentation. This software is provided "as is" without express or* implied warranty.** Thanks to the following people who have provided enhancements and fixes:* Ron Ueberschaer, Christoph Keller, Scott Schwartz, Steven List,* DaviD W. Sanderson, Goran Bostrom, Michael Gleason, Glenn Kasten,* Edin Hodzic, Eric J Bivona, Kai Uwe Rommel, Danny Quah, Ulrich Betzler*/#include "getline.h"static int gl_tab(); /* forward reference needed for gl_tab_hook */int (*gl_in_hook)() = 0;int (*gl_out_hook)() = 0;int (*gl_tab_hook)() = gl_tab;#include <R_ext/rlocale.h>extern Rboolean mbcslocale;#define mbs_init(x) memset(x, 0, sizeof(mbstate_t))#include <string.h>#include <ctype.h>#include <setjmp.h>#include <stdlib.h>#include <stdio.h>#include <io.h>/******************** internal interface *********************************/static int BUF_SIZE; /* dimension of the buffer received*/static int gl_init_done = -1; /* terminal mode flag */static int gl_termw = 80; /* actual terminal width */static int gl_scroll = 27; /* width of EOL scrolling region */static int gl_width = 0; /* net size available for input */static int gl_extent = 0; /* how far to redraw, 0 means all */static int gl_overwrite = 0; /* overwrite mode */static int gl_pos, gl_cnt = 0; /* position and size of input */static char *gl_buf; /* input buffer */static char *gl_killbuf; /* killed text */static const char *gl_prompt; /* to save the prompt string */static int gl_search_mode = 0; /* search mode flag */static jmp_buf gl_jmp;static void gl_init(void); /* prepare to edit a line */static void gl_cleanup(void); /* to undo gl_init */static void gl_char_init(void); /* get ready for no echo input */static void gl_char_cleanup(void); /* undo gl_char_init */static size_t (*gl_strlen)() = (size_t(*)())strlen;/* returns printable prompt width */static void gl_addchar(int); /* install specified char */static void gl_del(int); /* del, either left (-1) or cur (0) */static void gl_error(const char *); /* write error msg and die */static void gl_fixup(const char *, int, int); /* fixup state variables and screen */static int gl_getc(void); /* read one char from terminal */static void gl_kill(int); /* delete to EOL */static void gl_newline(void); /* handle \n or \r */static void gl_putc(int); /* write one char to terminal */static void gl_puts(const char *); /* write a line to terminal */static void gl_redraw(void); /* issue \n and redraw all */static void gl_transpose(void); /* transpose two chars */static void gl_yank(void); /* yank killed text */static void gl_word(int); /* move a word */static void gl_killword(int);void gl_hist_init(int, int); /* initializes hist pointers */char *gl_hist_next(); /* return ptr to next item */char *gl_hist_prev(); /* return ptr to prev item */static char *hist_save(); /* makes copy of a string, without NL */static void search_addchar(int); /* increment search string */static void search_term(void); /* reset with current contents */static void search_back(int); /* look back for current string */static void search_forw(int); /* look forw for current string */static void gl_beep(void); /* try to play a system beep sound *//************************ nonportable part *********************************//*extern int write();extern void exit();*/#define WIN32_LEAN_AND_MEAN 1#include <windows.h>static HANDLE Win32OutputStream, Win32InputStream = NULL;static DWORD OldWin32Mode, AltIsDown;static voidgl_char_init() /* turn off input echo */{if (!Win32InputStream) {Win32InputStream = GetStdHandle(STD_INPUT_HANDLE);Win32OutputStream = GetStdHandle(STD_OUTPUT_HANDLE);}GetConsoleMode(Win32InputStream,&OldWin32Mode);SetConsoleMode(Win32InputStream, ENABLE_PROCESSED_INPUT); /* So ^C works */AltIsDown = 0;}static voidgl_char_cleanup(void) /* undo effects of gl_char_init */{SetConsoleMode(Win32InputStream,OldWin32Mode);AltIsDown = 0;}static intgl_getc(void)/* get a character without echoing it to screen */{int c;/* guido masarotto (3/12/98)* get Ansi char code from a Win32 console*/DWORD a;INPUT_RECORD r;DWORD st;WORD vk;CONSOLE_SCREEN_BUFFER_INFO csb;int bbb = 0, nAlt=0, n;c = 0;while (!c) {/*Following two lines seem to be needed under Win2kto reshow the cursor*/GetConsoleScreenBufferInfo(Win32OutputStream, &csb);SetConsoleCursorPosition(Win32OutputStream, csb.dwCursorPosition);ReadConsoleInput(Win32InputStream, &r, 1, &a);if (!(r.EventType == KEY_EVENT)) break;st = r.Event.KeyEvent.dwControlKeyState;vk = r.Event.KeyEvent.wVirtualKeyCode;if (r.Event.KeyEvent.bKeyDown) {if (vk == VK_MENU && (st & LEFT_ALT_PRESSED)) { /* VK_MENU isAlt or AltGr */AltIsDown = 1;nAlt = 0;bbb = 0;}else if (st & ENHANCED_KEY) {switch(vk) {case VK_LEFT: c=2 ;break;case VK_RIGHT: c=6;break;case VK_HOME: c='\001';break;case VK_END: c='\005';break;case VK_UP: c=16;break;case VK_DOWN: c=14;break;case VK_DELETE: c='\004';break;}}else if (AltIsDown) { /* Interpret Alt+xxx entries */switch (vk) {case VK_INSERT: n = 0; break;case VK_END: n = 1; break;case VK_DOWN: n = 2; break;case VK_NEXT: n = 3;break;case VK_LEFT: n = 4; break;case VK_CLEAR: n = 5; break;case VK_RIGHT: n = 6; break;case VK_HOME: n = 7; break;case VK_UP: n = 8; break;case VK_PRIOR: n = 9; break;default: n = -1;}if (n >= 0) bbb = 10 * bbb + n;nAlt += 1;if (nAlt==3) {c = (bbb < 256) && (bbb > 0) ? bbb : 0;bbb = 0;nAlt = 0;}}else/* There is also UnicodeChar -- not clear how it works */c = r.Event.KeyEvent.uChar.AsciiChar;}else if (vk == VK_MENU && AltIsDown) {/* Alt key up event: could be AltGr, but let's hope usersonly press one of them at a time. */AltIsDown = 0;c = (bbb < 256) && (bbb > 0) ? bbb : 0;bbb = 0;nAlt = 0;}if ((c < -127) || (c > 255)) c = 0;if (c < 0) c = 256 + c;}return c;}static voidgl_putc(int c){int ch = c;write(1, &ch, 1);if (ch == '\n') {ch = '\r';write(1, &ch, 1); /* RAW mode needs '\r', does not hurt */}}/******************** fairly portable part *********************************/static voidgl_puts(const char *const buf){int len;if (buf) {len = strlen(buf);write(1, buf, len);}}void gl_error(const char *const buf){int len = strlen(buf);gl_cleanup();write(2, buf, len);longjmp(gl_jmp,1);}static voidgl_init(void)/* set up variables and terminal */{if (gl_init_done < 0) { /* -1 only on startup */gl_hist_init(512, 1);}if (isatty(0) == 0 || isatty(1) == 0)gl_error("\n*** Error: getline(): not interactive, use stdio.\n");if (!(gl_killbuf=calloc(BUF_SIZE,sizeof(char))))gl_error("\n*** Error: getline(): no enough memory.\n");gl_char_init();gl_init_done = 1;}static voidgl_cleanup(void)/* undo effects of gl_init, as necessary */{if (gl_init_done > 0)gl_char_cleanup();free(gl_killbuf);gl_init_done = 0;}voidgl_setwidth(int w){if (w > 20) {gl_termw = w;gl_scroll = w / 3;} else {gl_error("\n*** Error: minimum screen width is 21\n");}}intgetline(const char *prompt, char *buf, int buflen){int c, loc, tmp;int mb_len;mbstate_t mb_st;int i;wchar_t wc;BUF_SIZE = buflen;gl_buf = buf;gl_buf[0] = '\0';if (setjmp(gl_jmp)) {gl_newline();gl_cleanup();return 0;}gl_init();gl_pos = 0;gl_prompt = (prompt)? prompt : "";if (gl_in_hook)gl_in_hook(gl_buf);gl_fixup(gl_prompt, -2, BUF_SIZE);while ((c = gl_getc()) >= 0) {gl_extent = 0; /* reset to full extent */if (!iscntrl(c)) {if (gl_search_mode)search_addchar(c);elsegl_addchar(c);} else {if (gl_search_mode) {if (c == '\033' || c == '\016' || c == '\020') {search_term();c = 0; /* ignore the character */} else if (c == '\010' || c == '\177') {search_addchar(-1); /* unwind search string */c = 0;} else if (c != '\022' && c != '\023') {search_term(); /* terminate and handle char */}}switch (c) {case '\n': case '\r': /* newline */gl_newline();gl_cleanup();return 0;/*NOTREACHED*/break;case '\001': gl_fixup(gl_prompt, -1, 0); /* ^A */break;case '\002': /* ^B */if(mbcslocale) {mb_len = 0;mbs_init(&mb_st);for(i = 0; i < gl_pos ;) {mbrtowc(&wc, gl_buf+i, MB_CUR_MAX, &mb_st);mb_len = Ri18n_wcwidth(wc);i += (wc==0) ? 0 : mb_len;}gl_fixup(gl_prompt, -1, gl_pos - mb_len);} elsegl_fixup(gl_prompt, -1, gl_pos-1);break;case '\003': /* ^C */gl_fixup(gl_prompt, -1, gl_cnt);gl_puts("^C\n");gl_kill(0);gl_fixup(gl_prompt, -2, BUF_SIZE);break;case '\004': /* ^D */if (gl_cnt == 0) {gl_buf[0] = 0;gl_cleanup();gl_putc('\n');return 0;} else {gl_del(0);}break;case '\005': gl_fixup(gl_prompt, -1, gl_cnt); /* ^E */break;case '\006': /* ^F */if(mbcslocale) {if(gl_pos >= gl_cnt) break;mb_len = 0;mbs_init(&mb_st);for(i = 0; i<= gl_pos ;){mbrtowc(&wc, gl_buf+i, MB_CUR_MAX, &mb_st);mb_len = Ri18n_wcwidth(wc);i += (wc==0) ? 0 : mb_len;}gl_fixup(gl_prompt, -1, gl_pos + mb_len);}elsegl_fixup(gl_prompt, -1, gl_pos+1);break;case '\010': case '\177': gl_del(-1); /* ^H and DEL */break;case '\t': /* TAB */if (gl_tab_hook) {tmp = gl_pos;loc = gl_tab_hook(gl_buf, gl_strlen(gl_prompt), &tmp);if (loc != -1 || tmp != gl_pos)gl_fixup(gl_prompt, loc, tmp);}break;case '\013': gl_kill(gl_pos); /* ^K */break;case '\014': gl_redraw(); /* ^L */break;case '\016': /* ^N */strncpy(gl_buf, gl_hist_next(), BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0';if (gl_in_hook)gl_in_hook(gl_buf);gl_fixup(gl_prompt, 0, BUF_SIZE);break;case '\017': gl_overwrite = !gl_overwrite; /* ^O */break;case '\020': /* ^P */strncpy(gl_buf, gl_hist_prev(),BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0';if (gl_in_hook)gl_in_hook(gl_buf);gl_fixup(gl_prompt, 0, BUF_SIZE);break;case '\022': search_back(1); /* ^R */break;case '\023': search_forw(1); /* ^S */break;case '\024': gl_transpose(); /* ^T */break;case '\025': gl_kill(0); /* ^U */break;case '\027': gl_killword(-1); /* ^W */break;case '\031': gl_yank(); /* ^Y */break;case '\032': /* ^Z */gl_newline();gl_cleanup();return 1;/*NOTREACHED*/break;case '\033': /* ansi arrow keys */c = gl_getc();if (c == '[') {switch(c = gl_getc()) {case 'A': /* up */strncpy(gl_buf, gl_hist_prev(), BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0';if (gl_in_hook)gl_in_hook(gl_buf);gl_fixup(gl_prompt, 0, BUF_SIZE);break;case 'B': /* down */strncpy(gl_buf, gl_hist_next(), BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0';if (gl_in_hook)gl_in_hook(gl_buf);gl_fixup(gl_prompt, 0, BUF_SIZE);break;case 'C': /* right */if(mbcslocale) {mb_len = 0;mbs_init(&mb_st);for(i = 0; i <= gl_pos ;) {mbrtowc(&wc, gl_buf+i, MB_CUR_MAX, &mb_st);mb_len = Ri18n_wcwidth(wc);i += (wc==0) ? 0 : mb_len;}gl_fixup(gl_prompt, -1, gl_pos + mb_len);} elsegl_fixup(gl_prompt, -1, gl_pos+1);break;case 'D': /* left */if(mbcslocale) {mb_len = 0;mbs_init(&mb_st);for(i = 0; i <= gl_pos ;) {mbrtowc(&wc, gl_buf+i, MB_CUR_MAX, &mb_st);mb_len = Ri18n_wcwidth(wc);i += (wc==0) ? 0 :mb_len;}gl_fixup(gl_prompt, -1, gl_pos - mb_len);} elsegl_fixup(gl_prompt, -1, gl_pos-1);break;default: gl_putc('\007'); /* who knows */break;}} else if (c == 'f' || c == 'F') {gl_word(1);} else if (c == 'b' || c == 'B') {gl_word(-1);} elsegl_putc('\007');break;default: /* check for a terminal signal */if (c > 0)gl_putc('\007');break;}}}gl_newline();gl_cleanup();return 0;}static voidgl_addchar(int c)/* adds the character c to the input buffer at current location */{int i;if (gl_cnt >= BUF_SIZE - 2) {gl_putc('\a');return;}if(mbcslocale) {mbstate_t mb_st;wchar_t wc;char s[9]; /* only 3 needed */int res;int clen ;s[0] = c;clen = 1;res = 0;/* This is a DBCS locale, so input is 1 or 2 bytes.This loop should not be necessary.*/if((unsigned int) c >= (unsigned int) 0x80) {while(clen <= MB_CUR_MAX) {mbs_init(&mb_st);res = mbrtowc(&wc, s, clen, &mb_st);if(res >= 0) break;if(res == -1)gl_error("invalid multibyte character in mbcs_get_next");/* so res == -2 */c = gl_getc();if(c == EOF)gl_error("EOF whilst reading MBCS char");s[clen++] = c;} /* we've tried enough, so must be complete or invalid by now */}if( res >= 0 ) {if (!(gl_overwrite == 0 || gl_pos == gl_cnt))gl_del(0);for (i = gl_cnt; i >= gl_pos; i--)gl_buf[i+clen] = gl_buf[i];for (i = 0; i < clen; i++)gl_buf[gl_pos + i] = s[i];gl_fixup(gl_prompt, gl_pos, gl_pos+clen);}} elseif (gl_overwrite == 0 || gl_pos == gl_cnt) {for (i = gl_cnt; i >= gl_pos; i--)gl_buf[i+1] = gl_buf[i];gl_buf[gl_pos] = (char) c;gl_fixup(gl_prompt, gl_pos, gl_pos+1);} else {gl_buf[gl_pos] = (char) c;gl_extent = 1;gl_fixup(gl_prompt, gl_pos, gl_pos+1);}}static voidgl_yank(void)/* adds the kill buffer to the input buffer at current location */{int i, len;len = strlen(gl_killbuf);if (len > 0) {if (gl_overwrite == 0) {if (gl_cnt + len >= BUF_SIZE - 1)gl_error("\n*** Error: getline(): input buffer overflow\n");for (i=gl_cnt; i >= gl_pos; i--)gl_buf[i+len] = gl_buf[i];for (i=0; i < len; i++)gl_buf[gl_pos+i] = gl_killbuf[i];gl_fixup(gl_prompt, gl_pos, gl_pos+len);} else {if (gl_pos + len > gl_cnt) {if (gl_pos + len >= BUF_SIZE - 1)gl_error("\n*** Error: getline(): input buffer overflow\n");gl_buf[gl_pos + len] = 0;}for (i=0; i < len; i++)gl_buf[gl_pos+i] = gl_killbuf[i];gl_extent = len;gl_fixup(gl_prompt, gl_pos, gl_pos+len);}} elsegl_beep();}static voidgl_transpose(void)/* switch character under cursor and to left of cursor */{int c;if (gl_pos > 0 && gl_cnt > gl_pos) {if(mbcslocale) {int l_len = 0;int r_len = 0;int i = 0;int j = 0;mbstate_t mb_st;mbs_init(&mb_st);for (i = 0; i < gl_pos;) {l_len = mbrlen(gl_buf+i, MB_CUR_MAX, &mb_st);i += l_len;}mbs_init(&mb_st);r_len = mbrlen(gl_buf+gl_pos, MB_CUR_MAX, &mb_st);for (i = 0; i < r_len; i++) {for(j = 0; j < l_len; j++) {c = gl_buf[gl_pos+i-j];gl_buf[gl_pos+i-j] = gl_buf[gl_pos+i-j-1];gl_buf[gl_pos+i-j-1] = (char)c;}}gl_extent = l_len + r_len;gl_fixup(gl_prompt, gl_pos - l_len, gl_pos + (r_len - l_len));} else {c = gl_buf[gl_pos-1];gl_buf[gl_pos-1] = gl_buf[gl_pos];gl_buf[gl_pos] = (char) c;gl_extent = 2;gl_fixup(gl_prompt, gl_pos-1, gl_pos);}} elsegl_beep();}static voidgl_newline(void)/** Cleans up entire line before returning to caller. A \n is appended.* If line longer than screen, we redraw starting at beginning*/{int change = gl_cnt;int len = gl_cnt;int loc = gl_width - 5; /* shifts line back to start position */if (gl_cnt >= BUF_SIZE - 1) {gl_error("\n*** Error: getline(): input buffer overflow\n");}if (gl_out_hook) {change = gl_out_hook(gl_buf);len = strlen(gl_buf);}if (loc > len)loc = len;gl_fixup(gl_prompt, change, loc); /* must do this before appending \n */gl_buf[len] = '\n';gl_buf[len+1] = '\0';gl_putc('\n');}static voidgl_del(int loc)/** Delete a character. The loc variable can be:* -1 : delete character to left of cursor* 0 : delete character under cursor*/{int i;if(mbcslocale) {int mb_len;mbstate_t mb_st;wchar_t wc;mb_len=0;mbs_init(&mb_st);if ((loc == -1 && gl_pos > 0) || (loc == 0 && gl_pos < gl_cnt)) {for(i = 0; i<= gl_pos + loc;) {mbrtowc(&wc,gl_buf+i, MB_CUR_MAX, &mb_st);mb_len = Ri18n_wcwidth(wc);i += (wc==0) ? 0 : mb_len;}for (i = gl_pos+(loc*mb_len); i <= gl_cnt - mb_len; i++)gl_buf[i] = gl_buf[i + mb_len];gl_fixup(gl_prompt,gl_pos+(loc * mb_len) , gl_pos+(loc * mb_len));} elsegl_beep();} elseif ((loc == -1 && gl_pos > 0) || (loc == 0 && gl_pos < gl_cnt)) {for (i = gl_pos+loc; i < gl_cnt; i++)gl_buf[i] = gl_buf[i+1];gl_fixup(gl_prompt, gl_pos+loc, gl_pos+loc);} elsegl_beep();}static voidgl_kill(int pos)/* delete from pos to the end of line */{if (pos < gl_cnt) {strcpy(gl_killbuf, gl_buf + pos);gl_buf[pos] = '\0';gl_fixup(gl_prompt, pos, pos);} elsegl_beep();}static voidgl_killword(int direction){int pos = gl_pos;int startpos = gl_pos;int tmp;int i;if (direction > 0) { /* forward */while (!isspace(gl_buf[pos]) && pos < gl_cnt)pos++;while (isspace(gl_buf[pos]) && pos < gl_cnt)pos++;} else { /* backward */if (pos > 0)pos--;while (isspace(gl_buf[pos]) && pos > 0)pos--;while (!isspace(gl_buf[pos]) && pos > 0)pos--;if (pos < gl_cnt && isspace(gl_buf[pos])) /* move onto word */pos++;}if (pos < startpos) {tmp = pos;pos = startpos;startpos = tmp;}memcpy(gl_killbuf, gl_buf + startpos, (size_t) (pos - startpos));gl_killbuf[pos - startpos] = '\0';if (isspace(gl_killbuf[pos - startpos - 1]))gl_killbuf[pos - startpos - 1] = '\0';gl_fixup(gl_prompt, -1, startpos);for (i=0, tmp=pos - startpos; i<tmp; i++)gl_del(0);} /* gl_killword */static voidgl_word(int direction)/* move forward or backword one word */{int pos = gl_pos;if (direction > 0) { /* forward */while (!isspace(gl_buf[pos]) && pos < gl_cnt)pos++;while (isspace(gl_buf[pos]) && pos < gl_cnt)pos++;} else { /* backword */if (pos > 0)pos--;while (isspace(gl_buf[pos]) && pos > 0)pos--;while (!isspace(gl_buf[pos]) && pos > 0)pos--;if (pos < gl_cnt && isspace(gl_buf[pos])) /* move onto word */pos++;}gl_fixup(gl_prompt, -1, pos);}static voidgl_redraw(void)/* emit a newline, reset and redraw prompt and current input line */{if (gl_init_done > 0) {gl_putc('\n');gl_fixup(gl_prompt, -2, gl_pos);}}static voidgl_fixup(const char *prompt, int change, int cursor)/** This function is used both for redrawing when input changes or for* moving within the input line. The parameters are:* prompt: compared to last_prompt[] for changes;* change : the index of the start of changes in the input buffer,* with -1 indicating no changes, -2 indicating we're on* a new line, redraw everything.* cursor : the desired location of the cursor after the call.* A value of BUF_SIZE can be used to indicate the cursor should* move just past the end of the input line.*/{static int gl_shift; /* index of first on screen character */static int off_right; /* true if more text right of screen */static int off_left; /* true if more text left of screen */static char last_prompt[80] = "";int left = 0, right = -1; /* bounds for redraw */int pad; /* how much to erase at end of line */int backup; /* how far to backup before fixing */int new_shift; /* value of shift based on cursor */int extra; /* adjusts when shift (scroll) happens */int i;int new_right = -1; /* alternate right bound, using gl_extent */int l1, l2, ll;if (change == -2) { /* reset */while (gl_pos--) gl_putc('\b');gl_pos = gl_cnt = gl_shift = off_right = off_left = 0;gl_puts(prompt);strcpy(last_prompt, prompt);change = 0;gl_width = gl_termw - gl_strlen(prompt);} else if (strcmp(prompt, last_prompt) != 0) {l1 = gl_strlen(last_prompt);l2 = gl_strlen(prompt);ll = gl_pos + l1;gl_cnt = gl_cnt + l1 - l2;strcpy(last_prompt, prompt);while (ll--) gl_putc('\b');gl_puts(prompt);gl_pos = gl_shift;gl_width = gl_termw - l2;change = 0;}pad = (off_right)? gl_width - 1 : gl_cnt - gl_shift; /* old length */backup = gl_pos - gl_shift;if (change >= 0) {gl_cnt = strlen(gl_buf);if (change > gl_cnt)change = gl_cnt;}if (cursor > gl_cnt) {if (cursor != BUF_SIZE) /* BUF_SIZE means end of line */gl_putc('\007');cursor = gl_cnt;}if (cursor < 0) {gl_putc('\007');cursor = 0;}if (off_right || (off_left && cursor < gl_shift + gl_width - gl_scroll / 2))extra = 2; /* shift the scrolling boundary */elseextra = 0;new_shift = cursor + extra + gl_scroll - gl_width;if (new_shift > 0) {new_shift /= gl_scroll;new_shift *= gl_scroll;} elsenew_shift = 0;if (new_shift != gl_shift) { /* scroll occurs */gl_shift = new_shift;off_left = (gl_shift)? 1 : 0;off_right = (gl_cnt > gl_shift + gl_width - 1)? 1 : 0;left = gl_shift;new_right = right = (off_right)? gl_shift + gl_width - 2 : gl_cnt;} else if (change >= 0) { /* no scroll, but text changed */if (change < gl_shift + off_left) {left = gl_shift;} else {left = change;backup = gl_pos - change;}off_right = (gl_cnt > gl_shift + gl_width - 1)? 1 : 0;right = (off_right)? gl_shift + gl_width - 2 : gl_cnt;new_right = (gl_extent && (right > left + gl_extent))?left + gl_extent : right;}pad -= (off_right)? gl_width - 1 : gl_cnt - gl_shift;pad = (pad < 0)? 0 : pad;if (left <= right) { /* clean up screen */for (i=0; i < backup; i++)gl_putc('\b');if (left == gl_shift && off_left) {gl_putc('$');left++;}for (i=left; i < new_right; i++)gl_putc(gl_buf[i]);gl_pos = new_right;if (off_right && new_right == right) {gl_putc('$');gl_pos++;} else {for (i=0; i < pad; i++) /* erase remains of prev line */gl_putc(' ');gl_pos += pad;}}i = gl_pos - cursor; /* move to final cursor location */if (i > 0) {while (i--)gl_putc('\b');} else {for (i=gl_pos; i < cursor; i++)gl_putc(gl_buf[i]);}gl_pos = cursor;}static intgl_tab(char *buf, int offset, int *loc)/* default tab handler, acts like tabstops every 8 cols */{int i, count, len;len = strlen(buf);count = 8 - (offset + *loc) % 8;for (i=len; i >= *loc; i--)buf[i+count] = buf[i];for (i=0; i < count; i++)buf[*loc+i] = ' ';i = *loc;*loc = i + count;return i;}/******************* strlen stuff **************************************/void gl_strwidth(func)size_t (*func)();{if (func != 0) {gl_strlen = func;}}/******************* History stuff **************************************/static int HIST_SIZE = 512;static int hist_pos = 0, hist_last = 0, gl_beep_on = 1;static char **hist_buf;voidgl_hist_init(int size, int beep){int i;HIST_SIZE = size;hist_buf = (char **) malloc(size * sizeof(char *));if(!hist_buf)gl_error("\n*** Error: gl_hist_init() failed on malloc\n");hist_buf[0] = "";for (i = 1; i < HIST_SIZE; i++)hist_buf[i] = (char *)0;hist_pos = hist_last = 0;gl_init_done = 0;gl_beep_on = beep;}voidgl_histadd(const char *buf){const char *p = buf;/* in case we call gl_histadd() before we call getline() */if (gl_init_done < 0) { /* -1 only on startup */gl_hist_init(512, 1);gl_init_done = 0;}while (*p == ' ' || *p == '\t' || *p == '\n')p++;if (*p) {hist_buf[hist_last] = hist_save(buf);hist_last = hist_last + 1;if(hist_last > HIST_SIZE - 1) {int i, size = HIST_SIZE + 512;hist_buf = (char **) realloc(hist_buf, size * sizeof(char *));if(!hist_buf)gl_error("\n*** Error: gl_histadd() failed on realloc\n");for(i = HIST_SIZE; i < size; i++)hist_buf[i] = (char *)0;HIST_SIZE = size;}hist_buf[hist_last] = "";}hist_pos = hist_last;}char *gl_hist_prev(void)/* loads previous hist entry into input buffer, sticks on first */{char *p = 0;int next = hist_pos - 1;if (hist_buf[hist_pos] != 0 && next >= 0) {hist_pos = next;p = hist_buf[hist_pos];}if (p == 0) {p = "";gl_beep();}return p;}char *gl_hist_next(void)/* loads next hist entry into input buffer, clears on last */{char *p = 0;if (hist_pos != hist_last) {hist_pos = hist_pos+1;p = hist_buf[hist_pos];}if (p == 0) {p = "";gl_beep();}return p;}static char *hist_save(const char *p)/* makes a copy of the string */{char *s = 0;int len = strlen(p);char *nl = strchr(p, '\n');if (nl) {if ((s = (char *) malloc(len)) != 0) {strncpy(s, p, len-1);s[len-1] = 0;}} else {if ((s = (char *) malloc(len+1)) != 0) {strcpy(s, p);}}if (s == 0)gl_error("\n*** Error: hist_save() failed on malloc\n");return s;}void gl_savehistory(const char *file, int size){FILE *fp;int i, init;if (!file || !hist_last) return;fp = fopen(file, "w");if (!fp) {char msg[256];sprintf(msg, "Unable to open %s", file);R_ShowMessage(msg);return;}init = hist_last - size;init = (init < 0) ? 0 : init;for (i = init; i < hist_last; i++)fprintf(fp, "%s\n", hist_buf[i]);fclose(fp);}void gl_loadhistory(const char *file){FILE *fp;int i;char buf[1000];if (!file) return;fp = fopen(file, "r");if (!fp) {return;}for(i = 0;; i++) {if(!fgets(buf, 1000, fp)) break;gl_histadd(buf);}fclose(fp);}/******************* Search stuff **************************************/static char search_prompt[101]; /* prompt includes search string */static char search_string[100];static int search_pos = 0; /* current location in search_string */static int search_forw_flg = 0; /* search direction flag */static int search_last = 0; /* last match found */static voidsearch_update(int c){if (c == 0) {search_pos = 0;search_string[0] = 0;search_prompt[0] = '?';search_prompt[1] = ' ';search_prompt[2] = 0;} else if (c > 0) {search_string[search_pos] = (char) c;search_string[search_pos+1] = (char) 0;search_prompt[search_pos] = (char) c;search_prompt[search_pos+1] = (char) '?';search_prompt[search_pos+2] = (char) ' ';search_prompt[search_pos+3] = (char) 0;search_pos++;} else {if (search_pos > 0) {search_pos--;search_string[search_pos] = (char) 0;search_prompt[search_pos] = (char) '?';search_prompt[search_pos+1] = (char) ' ';search_prompt[search_pos+2] = (char) 0;} else {gl_beep();hist_pos = hist_last;}}}static voidsearch_addchar(int c){char *loc;search_update(c);if (c < 0) {if (search_pos > 0) {hist_pos = search_last;} else {gl_buf[0] = 0;hist_pos = hist_last;}strncpy(gl_buf, hist_buf[hist_pos],BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0' ;}if ((loc = strstr(gl_buf, search_string)) != 0) {gl_fixup(search_prompt, 0, loc - gl_buf);} else if (search_pos > 0) {if (search_forw_flg) {search_forw(0);} else {search_back(0);}} else {gl_fixup(search_prompt, 0, 0);}}static voidsearch_term(void){gl_search_mode = 0;if (gl_buf[0] == 0) /* not found, reset hist list */hist_pos = hist_last;if (gl_in_hook)gl_in_hook(gl_buf);gl_fixup(gl_prompt, 0, gl_pos);}static voidsearch_back(int new_search){int found = 0;char *p, *loc;search_forw_flg = 0;if (gl_search_mode == 0) {search_last = hist_pos = hist_last;search_update(0);gl_search_mode = 1;gl_buf[0] = 0;gl_fixup(search_prompt, 0, 0);} else if (search_pos > 0) {while (!found) {p = gl_hist_prev();if (*p == 0) { /* not found, done looking */gl_buf[0] = 0;gl_fixup(search_prompt, 0, 0);found = 1;} else if ((loc = strstr(p, search_string)) != 0) {strncpy(gl_buf, p, BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0';gl_fixup(search_prompt, 0, loc - p);if (new_search)search_last = hist_pos;found = 1;}}} else {gl_beep();}}static voidsearch_forw(int new_search){int found = 0;char *p, *loc;search_forw_flg = 1;if (gl_search_mode == 0) {search_last = hist_pos = hist_last;search_update(0);gl_search_mode = 1;gl_buf[0] = 0;gl_fixup(search_prompt, 0, 0);} else if (search_pos > 0) {while (!found) {p = gl_hist_next();if (*p == 0) { /* not found, done looking */gl_buf[0] = 0;gl_fixup(search_prompt, 0, 0);found = 1;} else if ((loc = strstr(p, search_string)) != 0) {strncpy(gl_buf, p, BUF_SIZE-2);gl_buf[BUF_SIZE-2] = '\0';gl_fixup(search_prompt, 0, loc - p);if (new_search)search_last = hist_pos;found = 1;}}} else {gl_beep();}}static voidgl_beep(void){if(gl_beep_on) MessageBeep(MB_OK);} /* gl_beep */