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cf87ebf2 MM |
1 | /* linenoise.c -- guerrilla line editing library against the idea that a |
2 | * line editing lib needs to be 20,000 lines of C code. | |
3 | * | |
4 | * You can find the latest source code at: | |
5 | * | |
6 | * http://github.com/antirez/linenoise | |
7 | * | |
8 | * Does a number of crazy assumptions that happen to be true in 99.9999% of | |
9 | * the 2010 UNIX computers around. | |
10 | * | |
11 | * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com> | |
12 | * All rights reserved. | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions are met: | |
16 | * | |
17 | * * Redistributions of source code must retain the above copyright notice, | |
18 | * this list of conditions and the following disclaimer. | |
19 | * * Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * * Neither the name of Redis nor the names of its contributors may be used | |
23 | * to endorse or promote products derived from this software without | |
24 | * specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
27 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
30 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
31 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
33 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
34 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
35 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
36 | * POSSIBILITY OF SUCH DAMAGE. | |
37 | * | |
38 | * References: | |
39 | * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html | |
40 | * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html | |
41 | * | |
42 | * Todo list: | |
43 | * - Switch to gets() if $TERM is something we can't support. | |
44 | * - Filter bogus Ctrl+<char> combinations. | |
45 | * - Win32 support | |
46 | * | |
47 | * Bloat: | |
48 | * - Completion? | |
49 | * - History search like Ctrl+r in readline? | |
50 | * | |
51 | * List of escape sequences used by this program, we do everything just | |
52 | * with three sequences. In order to be so cheap we may have some | |
53 | * flickering effect with some slow terminal, but the lesser sequences | |
54 | * the more compatible. | |
55 | * | |
56 | * CHA (Cursor Horizontal Absolute) | |
57 | * Sequence: ESC [ n G | |
58 | * Effect: moves cursor to column n | |
59 | * | |
60 | * EL (Erase Line) | |
61 | * Sequence: ESC [ n K | |
62 | * Effect: if n is 0 or missing, clear from cursor to end of line | |
63 | * Effect: if n is 1, clear from beginning of line to cursor | |
64 | * Effect: if n is 2, clear entire line | |
65 | * | |
66 | * CUF (CUrsor Forward) | |
67 | * Sequence: ESC [ n C | |
68 | * Effect: moves cursor forward of n chars | |
69 | * | |
70 | */ | |
71 | ||
72 | #include <termios.h> | |
73 | #include <unistd.h> | |
74 | #include <stdlib.h> | |
75 | #include <stdio.h> | |
76 | #include <errno.h> | |
77 | #include <string.h> | |
78 | #include <stdlib.h> | |
79 | #include <sys/types.h> | |
80 | #include <sys/ioctl.h> | |
81 | #include <unistd.h> | |
ff405818 | 82 | #include "linenoise.h" |
cf87ebf2 | 83 | |
99628c1a | 84 | #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100 |
cf87ebf2 | 85 | #define LINENOISE_MAX_LINE 4096 |
a737ada1 | 86 | static char *unsupported_term[] = {"dumb","cons25",NULL}; |
ff405818 | 87 | static linenoiseCompletionCallback *completionCallback = NULL; |
cf87ebf2 MM |
88 | |
89 | static struct termios orig_termios; /* in order to restore at exit */ | |
90 | static int rawmode = 0; /* for atexit() function to check if restore is needed*/ | |
91 | static int atexit_registered = 0; /* register atexit just 1 time */ | |
99628c1a | 92 | static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN; |
cf87ebf2 MM |
93 | static int history_len = 0; |
94 | char **history = NULL; | |
95 | ||
96 | static void linenoiseAtExit(void); | |
a737ada1 | 97 | int linenoiseHistoryAdd(const char *line); |
98 | ||
99 | static int isUnsupportedTerm(void) { | |
100 | char *term = getenv("TERM"); | |
101 | int j; | |
102 | ||
103 | if (term == NULL) return 0; | |
104 | for (j = 0; unsupported_term[j]; j++) | |
105 | if (!strcasecmp(term,unsupported_term[j])) return 1; | |
106 | return 0; | |
107 | } | |
cf87ebf2 MM |
108 | |
109 | static void freeHistory(void) { | |
110 | if (history) { | |
111 | int j; | |
112 | ||
113 | for (j = 0; j < history_len; j++) | |
114 | free(history[j]); | |
115 | free(history); | |
116 | } | |
117 | } | |
118 | ||
119 | static int enableRawMode(int fd) { | |
120 | struct termios raw; | |
121 | ||
122 | if (!isatty(STDIN_FILENO)) goto fatal; | |
123 | if (!atexit_registered) { | |
124 | atexit(linenoiseAtExit); | |
125 | atexit_registered = 1; | |
126 | } | |
127 | if (tcgetattr(fd,&orig_termios) == -1) goto fatal; | |
128 | ||
129 | raw = orig_termios; /* modify the original mode */ | |
130 | /* input modes: no break, no CR to NL, no parity check, no strip char, | |
131 | * no start/stop output control. */ | |
132 | raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON); | |
133 | /* output modes - disable post processing */ | |
134 | raw.c_oflag &= ~(OPOST); | |
135 | /* control modes - set 8 bit chars */ | |
136 | raw.c_cflag |= (CS8); | |
137 | /* local modes - choing off, canonical off, no extended functions, | |
138 | * no signal chars (^Z,^C) */ | |
139 | raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG); | |
140 | /* control chars - set return condition: min number of bytes and timer. | |
141 | * We want read to return every single byte, without timeout. */ | |
142 | raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */ | |
143 | ||
144 | /* put terminal in raw mode after flushing */ | |
145 | if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal; | |
146 | rawmode = 1; | |
147 | return 0; | |
148 | ||
149 | fatal: | |
150 | errno = ENOTTY; | |
151 | return -1; | |
152 | } | |
153 | ||
154 | static void disableRawMode(int fd) { | |
155 | /* Don't even check the return value as it's too late. */ | |
156 | if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1) | |
157 | rawmode = 0; | |
158 | } | |
159 | ||
160 | /* At exit we'll try to fix the terminal to the initial conditions. */ | |
161 | static void linenoiseAtExit(void) { | |
162 | disableRawMode(STDIN_FILENO); | |
163 | freeHistory(); | |
164 | } | |
165 | ||
166 | static int getColumns(void) { | |
167 | struct winsize ws; | |
168 | ||
169 | if (ioctl(1, TIOCGWINSZ, &ws) == -1) return 80; | |
170 | return ws.ws_col; | |
171 | } | |
172 | ||
173 | static void refreshLine(int fd, const char *prompt, char *buf, size_t len, size_t pos, size_t cols) { | |
174 | char seq[64]; | |
175 | size_t plen = strlen(prompt); | |
176 | ||
177 | while((plen+pos) >= cols) { | |
178 | buf++; | |
179 | len--; | |
180 | pos--; | |
181 | } | |
182 | while (plen+len > cols) { | |
183 | len--; | |
184 | } | |
185 | ||
186 | /* Cursor to left edge */ | |
187 | snprintf(seq,64,"\x1b[0G"); | |
188 | if (write(fd,seq,strlen(seq)) == -1) return; | |
189 | /* Write the prompt and the current buffer content */ | |
190 | if (write(fd,prompt,strlen(prompt)) == -1) return; | |
191 | if (write(fd,buf,len) == -1) return; | |
192 | /* Erase to right */ | |
193 | snprintf(seq,64,"\x1b[0K"); | |
194 | if (write(fd,seq,strlen(seq)) == -1) return; | |
195 | /* Move cursor to original position. */ | |
196 | snprintf(seq,64,"\x1b[0G\x1b[%dC", (int)(pos+plen)); | |
197 | if (write(fd,seq,strlen(seq)) == -1) return; | |
198 | } | |
199 | ||
ff405818 PN |
200 | static void beep() { |
201 | fprintf(stderr, "\x7"); | |
202 | fflush(stderr); | |
203 | } | |
204 | ||
205 | static void freeCompletions(linenoiseCompletions *lc) { | |
206 | size_t i; | |
207 | for (i = 0; i < lc->len; i++) | |
208 | free(lc->cvec[i]); | |
209 | if (lc->cvec != NULL) | |
210 | free(lc->cvec); | |
211 | } | |
212 | ||
213 | static int completeLine(int fd, const char *prompt, char *buf, size_t buflen, size_t *len, size_t *pos, size_t cols) { | |
214 | linenoiseCompletions lc = { 0, NULL }; | |
215 | int nread, nwritten; | |
216 | char c = 0; | |
217 | ||
218 | completionCallback(buf,&lc); | |
219 | if (lc.len == 0) { | |
220 | beep(); | |
221 | } else { | |
222 | size_t stop = 0, i = 0; | |
223 | size_t clen; | |
224 | ||
225 | while(!stop) { | |
226 | /* Show completion or original buffer */ | |
227 | if (i < lc.len) { | |
228 | clen = strlen(lc.cvec[i]); | |
229 | refreshLine(fd,prompt,lc.cvec[i],clen,clen,cols); | |
230 | } else { | |
231 | refreshLine(fd,prompt,buf,*len,*pos,cols); | |
232 | } | |
233 | ||
234 | nread = read(fd,&c,1); | |
235 | if (nread <= 0) { | |
236 | freeCompletions(&lc); | |
237 | return -1; | |
238 | } | |
239 | ||
240 | switch(c) { | |
241 | case 9: /* tab */ | |
242 | i = (i+1) % (lc.len+1); | |
243 | if (i == lc.len) beep(); | |
244 | break; | |
245 | case 27: /* escape */ | |
c54afb6d PN |
246 | /* Re-show original buffer */ |
247 | if (i < lc.len) { | |
248 | refreshLine(fd,prompt,buf,*len,*pos,cols); | |
249 | } | |
ff405818 PN |
250 | stop = 1; |
251 | break; | |
252 | default: | |
c54afb6d | 253 | /* Update buffer and return */ |
ff405818 PN |
254 | if (i < lc.len) { |
255 | nwritten = snprintf(buf,buflen,"%s",lc.cvec[i]); | |
256 | *len = *pos = nwritten; | |
257 | } | |
258 | stop = 1; | |
259 | break; | |
260 | } | |
261 | } | |
262 | } | |
263 | ||
264 | freeCompletions(&lc); | |
265 | return c; /* Return last read character */ | |
266 | } | |
267 | ||
cf87ebf2 MM |
268 | static int linenoisePrompt(int fd, char *buf, size_t buflen, const char *prompt) { |
269 | size_t plen = strlen(prompt); | |
270 | size_t pos = 0; | |
271 | size_t len = 0; | |
272 | size_t cols = getColumns(); | |
273 | int history_index = 0; | |
274 | ||
275 | buf[0] = '\0'; | |
276 | buflen--; /* Make sure there is always space for the nulterm */ | |
277 | ||
278 | /* The latest history entry is always our current buffer, that | |
279 | * initially is just an empty string. */ | |
280 | linenoiseHistoryAdd(""); | |
281 | ||
282 | if (write(fd,prompt,plen) == -1) return -1; | |
283 | while(1) { | |
284 | char c; | |
285 | int nread; | |
e902b579 | 286 | char seq[2], seq2[2]; |
cf87ebf2 MM |
287 | |
288 | nread = read(fd,&c,1); | |
289 | if (nread <= 0) return len; | |
ff405818 PN |
290 | |
291 | /* Only autocomplete when the callback is set. It returns < 0 when | |
292 | * there was an error reading from fd. Otherwise it will return the | |
293 | * character that should be handled next. */ | |
294 | if (c == 9 && completionCallback != NULL) { | |
295 | c = completeLine(fd,prompt,buf,buflen,&len,&pos,cols); | |
296 | /* Return on errors */ | |
297 | if (c < 0) return len; | |
298 | /* Read next character when 0 */ | |
299 | if (c == 0) continue; | |
300 | } | |
301 | ||
cf87ebf2 MM |
302 | switch(c) { |
303 | case 13: /* enter */ | |
cf87ebf2 MM |
304 | case 4: /* ctrl-d */ |
305 | history_len--; | |
99628c1a | 306 | free(history[history_len]); |
307 | return (len == 0 && c == 4) ? -1 : (int)len; | |
cf87ebf2 MM |
308 | case 3: /* ctrl-c */ |
309 | errno = EAGAIN; | |
310 | return -1; | |
311 | case 127: /* backspace */ | |
312 | case 8: /* ctrl-h */ | |
313 | if (pos > 0 && len > 0) { | |
314 | memmove(buf+pos-1,buf+pos,len-pos); | |
315 | pos--; | |
316 | len--; | |
317 | buf[len] = '\0'; | |
318 | refreshLine(fd,prompt,buf,len,pos,cols); | |
319 | } | |
320 | break; | |
321 | case 20: /* ctrl-t */ | |
322 | if (pos > 0 && pos < len) { | |
323 | int aux = buf[pos-1]; | |
324 | buf[pos-1] = buf[pos]; | |
325 | buf[pos] = aux; | |
326 | if (pos != len-1) pos++; | |
327 | refreshLine(fd,prompt,buf,len,pos,cols); | |
328 | } | |
329 | break; | |
330 | case 2: /* ctrl-b */ | |
331 | goto left_arrow; | |
332 | case 6: /* ctrl-f */ | |
333 | goto right_arrow; | |
334 | case 16: /* ctrl-p */ | |
335 | seq[1] = 65; | |
336 | goto up_down_arrow; | |
337 | case 14: /* ctrl-n */ | |
338 | seq[1] = 66; | |
339 | goto up_down_arrow; | |
340 | break; | |
341 | case 27: /* escape sequence */ | |
342 | if (read(fd,seq,2) == -1) break; | |
343 | if (seq[0] == 91 && seq[1] == 68) { | |
344 | left_arrow: | |
345 | /* left arrow */ | |
346 | if (pos > 0) { | |
347 | pos--; | |
348 | refreshLine(fd,prompt,buf,len,pos,cols); | |
349 | } | |
350 | } else if (seq[0] == 91 && seq[1] == 67) { | |
351 | right_arrow: | |
352 | /* right arrow */ | |
353 | if (pos != len) { | |
354 | pos++; | |
355 | refreshLine(fd,prompt,buf,len,pos,cols); | |
356 | } | |
357 | } else if (seq[0] == 91 && (seq[1] == 65 || seq[1] == 66)) { | |
358 | up_down_arrow: | |
359 | /* up and down arrow: history */ | |
360 | if (history_len > 1) { | |
361 | /* Update the current history entry before to | |
362 | * overwrite it with tne next one. */ | |
363 | free(history[history_len-1-history_index]); | |
364 | history[history_len-1-history_index] = strdup(buf); | |
365 | /* Show the new entry */ | |
366 | history_index += (seq[1] == 65) ? 1 : -1; | |
367 | if (history_index < 0) { | |
368 | history_index = 0; | |
369 | break; | |
370 | } else if (history_index >= history_len) { | |
371 | history_index = history_len-1; | |
372 | break; | |
373 | } | |
374 | strncpy(buf,history[history_len-1-history_index],buflen); | |
375 | buf[buflen] = '\0'; | |
376 | len = pos = strlen(buf); | |
377 | refreshLine(fd,prompt,buf,len,pos,cols); | |
378 | } | |
e902b579 PN |
379 | } else if (seq[0] == 91 && seq[1] > 48 && seq[1] < 55) { |
380 | /* extended escape */ | |
381 | if (read(fd,seq2,2) == -1) break; | |
382 | if (seq[1] == 51 && seq2[0] == 126) { | |
383 | /* delete */ | |
384 | if (len > 0 && pos < len) { | |
385 | memmove(buf+pos,buf+pos+1,len-pos-1); | |
386 | len--; | |
387 | buf[len] = '\0'; | |
388 | refreshLine(fd,prompt,buf,len,pos,cols); | |
389 | } | |
390 | } | |
cf87ebf2 MM |
391 | } |
392 | break; | |
393 | default: | |
394 | if (len < buflen) { | |
395 | if (len == pos) { | |
396 | buf[pos] = c; | |
397 | pos++; | |
398 | len++; | |
399 | buf[len] = '\0'; | |
400 | if (plen+len < cols) { | |
401 | /* Avoid a full update of the line in the | |
402 | * trivial case. */ | |
403 | if (write(fd,&c,1) == -1) return -1; | |
404 | } else { | |
405 | refreshLine(fd,prompt,buf,len,pos,cols); | |
406 | } | |
407 | } else { | |
408 | memmove(buf+pos+1,buf+pos,len-pos); | |
409 | buf[pos] = c; | |
410 | len++; | |
411 | pos++; | |
412 | buf[len] = '\0'; | |
413 | refreshLine(fd,prompt,buf,len,pos,cols); | |
414 | } | |
415 | } | |
416 | break; | |
417 | case 21: /* Ctrl+u, delete the whole line. */ | |
418 | buf[0] = '\0'; | |
419 | pos = len = 0; | |
420 | refreshLine(fd,prompt,buf,len,pos,cols); | |
421 | break; | |
422 | case 11: /* Ctrl+k, delete from current to end of line. */ | |
423 | buf[pos] = '\0'; | |
424 | len = pos; | |
425 | refreshLine(fd,prompt,buf,len,pos,cols); | |
426 | break; | |
427 | case 1: /* Ctrl+a, go to the start of the line */ | |
428 | pos = 0; | |
429 | refreshLine(fd,prompt,buf,len,pos,cols); | |
430 | break; | |
431 | case 5: /* ctrl+e, go to the end of the line */ | |
432 | pos = len; | |
433 | refreshLine(fd,prompt,buf,len,pos,cols); | |
434 | break; | |
435 | } | |
436 | } | |
437 | return len; | |
438 | } | |
439 | ||
440 | static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) { | |
441 | int fd = STDIN_FILENO; | |
442 | int count; | |
443 | ||
444 | if (buflen == 0) { | |
445 | errno = EINVAL; | |
446 | return -1; | |
447 | } | |
a737ada1 | 448 | if (!isatty(STDIN_FILENO)) { |
449 | if (fgets(buf, buflen, stdin) == NULL) return -1; | |
450 | count = strlen(buf); | |
451 | if (count && buf[count-1] == '\n') { | |
452 | count--; | |
453 | buf[count] = '\0'; | |
454 | } | |
455 | } else { | |
456 | if (enableRawMode(fd) == -1) return -1; | |
457 | count = linenoisePrompt(fd, buf, buflen, prompt); | |
458 | disableRawMode(fd); | |
459 | printf("\n"); | |
460 | } | |
cf87ebf2 MM |
461 | return count; |
462 | } | |
463 | ||
464 | char *linenoise(const char *prompt) { | |
465 | char buf[LINENOISE_MAX_LINE]; | |
466 | int count; | |
467 | ||
a737ada1 | 468 | if (isUnsupportedTerm()) { |
469 | size_t len; | |
470 | ||
471 | printf("%s",prompt); | |
472 | fflush(stdout); | |
473 | if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL; | |
474 | len = strlen(buf); | |
475 | while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) { | |
476 | len--; | |
477 | buf[len] = '\0'; | |
478 | } | |
479 | return strdup(buf); | |
480 | } else { | |
481 | count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt); | |
482 | if (count == -1) return NULL; | |
483 | return strdup(buf); | |
484 | } | |
cf87ebf2 MM |
485 | } |
486 | ||
ff405818 PN |
487 | /* Register a callback function to be called for tab-completion. */ |
488 | void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) { | |
489 | completionCallback = fn; | |
490 | } | |
491 | ||
492 | void linenoiseAddCompletion(linenoiseCompletions *lc, char *str) { | |
493 | size_t len = strlen(str); | |
494 | char *copy = malloc(len+1); | |
495 | memcpy(copy,str,len+1); | |
496 | lc->cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1)); | |
497 | lc->cvec[lc->len++] = copy; | |
498 | } | |
499 | ||
cf87ebf2 | 500 | /* Using a circular buffer is smarter, but a bit more complex to handle. */ |
a737ada1 | 501 | int linenoiseHistoryAdd(const char *line) { |
502 | char *linecopy; | |
503 | ||
cf87ebf2 | 504 | if (history_max_len == 0) return 0; |
99628c1a | 505 | if (history == NULL) { |
cf87ebf2 MM |
506 | history = malloc(sizeof(char*)*history_max_len); |
507 | if (history == NULL) return 0; | |
508 | memset(history,0,(sizeof(char*)*history_max_len)); | |
509 | } | |
a737ada1 | 510 | linecopy = strdup(line); |
511 | if (!linecopy) return 0; | |
cf87ebf2 | 512 | if (history_len == history_max_len) { |
99628c1a | 513 | free(history[0]); |
cf87ebf2 MM |
514 | memmove(history,history+1,sizeof(char*)*(history_max_len-1)); |
515 | history_len--; | |
516 | } | |
a737ada1 | 517 | history[history_len] = linecopy; |
cf87ebf2 MM |
518 | history_len++; |
519 | return 1; | |
520 | } | |
521 | ||
522 | int linenoiseHistorySetMaxLen(int len) { | |
523 | char **new; | |
524 | ||
525 | if (len < 1) return 0; | |
526 | if (history) { | |
527 | int tocopy = history_len; | |
528 | ||
529 | new = malloc(sizeof(char*)*len); | |
530 | if (new == NULL) return 0; | |
531 | if (len < tocopy) tocopy = len; | |
532 | memcpy(new,history+(history_max_len-tocopy), sizeof(char*)*tocopy); | |
533 | free(history); | |
534 | history = new; | |
535 | } | |
536 | history_max_len = len; | |
537 | if (history_len > history_max_len) | |
538 | history_len = history_max_len; | |
539 | return 1; | |
540 | } | |
99628c1a | 541 | |
542 | /* Save the history in the specified file. On success 0 is returned | |
543 | * otherwise -1 is returned. */ | |
544 | int linenoiseHistorySave(char *filename) { | |
545 | FILE *fp = fopen(filename,"w"); | |
546 | int j; | |
547 | ||
548 | if (fp == NULL) return -1; | |
549 | for (j = 0; j < history_len; j++) | |
550 | fprintf(fp,"%s\n",history[j]); | |
551 | fclose(fp); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | /* Load the history from the specified file. If the file does not exist | |
556 | * zero is returned and no operation is performed. | |
557 | * | |
558 | * If the file exists and the operation succeeded 0 is returned, otherwise | |
559 | * on error -1 is returned. */ | |
560 | int linenoiseHistoryLoad(char *filename) { | |
561 | FILE *fp = fopen(filename,"r"); | |
562 | char buf[LINENOISE_MAX_LINE]; | |
563 | ||
564 | if (fp == NULL) return -1; | |
565 | ||
566 | while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) { | |
567 | char *p; | |
568 | ||
569 | p = strchr(buf,'\r'); | |
570 | if (!p) p = strchr(buf,'\n'); | |
571 | if (p) *p = '\0'; | |
572 | linenoiseHistoryAdd(buf); | |
573 | } | |
574 | fclose(fp); | |
575 | return 0; | |
576 | } |