1 /****************************************
2 * Computer Algebra System SINGULAR *
3 ****************************************/
4 /*
5 * ABSTRACT: input from ttys, simulating fgets
6 */
7
8 #include "kernel/mod2.h"
9 #include <errno.h>
10
11 // ----------------------------------------
12 // system settings:
13
14 #undef USE_READLINE4
15
16 //----------------------------------------
17 #ifdef __CYGWIN__
18 #define READLINE_STATIC
19 #endif
20 #include "omalloc/omalloc.h"
21 #include "misc/options.h"
22
23 #include "kernel/oswrapper/feread.h"
24
25 #if defined(HAVE_DYN_RL)
26 #include <unistd.h>
27 #endif
28
29 static char * fe_fgets_stdin_init(const char *pr,char *s, int size);
30 char * (*fe_fgets_stdin)(const char *pr,char *s, int size)
31 = fe_fgets_stdin_init;
32
33 extern char *iiArithGetCmd(int);
34
35 /* ===================================================================*/
36 /* = static/dymanic readline = */
37 /* ===================================================================*/
38 #if defined(HAVE_READLINE) || defined(HAVE_DYN_RL) || defined(HAVE_LIBREADLINE)
39
40 #ifndef STDOUT_FILENO
41 #define STDOUT_FILENO 1
42 #endif
43
44 /* Generator function for command completion. STATE lets us know whether
45 * to start from scratch; without any state (i.e. STATE == 0), then we
46 * start at the top of the list.
47 */
48 #include "Singular/ipid.h"
49 extern "C"
command_generator(char * text,int state)50 char *command_generator (char *text, int state)
51 {
52 STATIC_VAR int list_index, len;
53 STATIC_VAR idhdl h;
54 const char *name;
55
56 /* If this is a new word to complete, initialize now. This includes
57 saving the length of TEXT for efficiency, and initializing the index
58 variable to 0. */
59 if (state==0)
60 {
61 list_index = 1;
62 len = strlen (text);
63 h=basePack->idroot;
64 }
65
66 /* Return the next name which partially matches from the command list. */
67 while ((name = iiArithGetCmd(list_index))!=NULL)
68 {
69 list_index++;
70
71 if (strncmp (name, text, len) == 0)
72 return (strdup(name));
73 }
74 if (len>1)
75 {
76 while (h!=NULL)
77 {
78 name=h->id;
79 h=h->next;
80 if (strncmp (name, text, len) == 0)
81 return (strdup(name));
82 }
83 }
84 /* If no names matched, then return NULL. */
85 return ((char *)NULL);
86 }
87 #endif
88
89 /* ===================================================================*/
90 /* = static readline = */
91 /* ===================================================================*/
92 /* some procedure are shared with "dynamic readline" */
93 #if (defined(HAVE_READLINE) || defined(HAVE_LIBREADLINE) || defined(HAVE_DYN_RL))
94 #include <unistd.h>
95 #include <stdio.h>
96 #include <stdlib.h>
97 #include <sys/types.h>
98 #include <sys/file.h>
99 #include <sys/stat.h>
100
101 // #undef READLINE_READLINE_H_OK
102
103 extern "C" {
104 typedef char * (*RL_PROC)(const char*,int);
105 #ifdef READLINE_READLINE_H_OK
106 #include <readline/readline.h>
107 #ifdef HAVE_READLINE_HISTORY_H
108 #include <readline/history.h>
109 #endif
110 #endif
111
112 #ifdef RL_VERSION_MAJOR
113 #if (RL_VERSION_MAJOR >= 4)
114 #define USE_READLINE4
115 #endif
116 #endif
117
118 #ifndef USE_READLINE4
119 #define rl_filename_completion_function filename_completion_function
120 #define rl_completion_matches completion_matches
121 #endif
122 #ifndef READLINE_READLINE_H_OK
123 /* declare everything we need explicitely and do not rely on includes */
124 EXTERN_VAR char * rl_readline_name;
125 EXTERN_VAR char *rl_line_buffer;
126 char *rl_filename_completion_function(const char*, int);
127 typedef char **CPPFunction ();
128
129 extern char ** rl_completion_matches (const char*, RL_PROC);
130 EXTERN_VAR CPPFunction * rl_attempted_completion_function;
131 EXTERN_VAR FILE * rl_outstream;
132 extern char * readline (const char *);
133 extern void add_history (char *);
134 extern int write_history ();
135 extern void using_history();
136 extern int read_history(char *);
137 extern int history_total_bytes();
138 #endif /* READLINE_READLINE_H_OK */
139
140 typedef char * (*PROC)();
141
142 typedef char **RL_CPPFunction (const char*, int,int);
143 }
144
145
146 char * fe_fgets_stdin_rl(const char *pr,char *s, int size);
147
148 /* Tell the GNU Readline library how to complete. We want to try to complete
149 on command names or on filenames if it is preceded by " */
150
151 /* Attempt to complete on the contents of TEXT. START and END show the
152 * region of TEXT that contains the word to complete. We can use the
153 * entire line in case we want to do some simple parsing. Return the
154 * array of matches, or NULL if there aren't any.
155 */
156 #if defined(HAVE_DYN_RL)
157 extern "C"
158 {
159 int fe_init_dyn_rl();
160 char *(*fe_filename_completion_function)(); /* 3 */
161 char *(* fe_readline) (char *); /* 4 */
162 VAR void (*fe_add_history) (char *); /* 5 */
163 VAR char ** fe_rl_readline_name; /* 6 */
164 VAR char **fe_rl_line_buffer; /* 7 */
165 char **(*fe_completion_matches)(...); /* 8 */
166 VAR CPPFunction **fe_rl_attempted_completion_function; /* 9 */
167 VAR FILE ** fe_rl_outstream; /* 10 */
168 VAR int (*fe_write_history) (); /* 11 */
169 VAR int (*fe_history_total_bytes) (); /* 12 */
170 VAR void (*fe_using_history) (); /* 13 */
171 VAR int (*fe_read_history) (char *); /* 14 */
172
173 }
174 #endif
singular_completion(char * text,int start,int end)175 char ** singular_completion (char *text, int start, int end)
176 {
177 /* If this word is not in a string, then it may be a command
178 to complete. Otherwise it may be the name of a file in the current
179 directory. */
180 #ifdef HAVE_DYN_RL
181 #define x_rl_line_buffer (*fe_rl_line_buffer)
182 #define x_rl_completion_matches (*fe_completion_matches)
183 #define x_rl_filename_completion_function (*fe_filename_completion_function)
184 #else
185 #define x_rl_line_buffer rl_line_buffer
186 #define x_rl_completion_matches rl_completion_matches
187 #define x_rl_filename_completion_function rl_filename_completion_function
188 #endif
189 if ((start>0) && (x_rl_line_buffer[start-1]=='"'))
190 return x_rl_completion_matches (text, (RL_PROC)x_rl_filename_completion_function);
191 char **m=x_rl_completion_matches (text, (RL_PROC)command_generator);
192 #undef x_rl_line_buffer
193 #undef x_rl_completion_matches
194 if (m==NULL)
195 {
196 m=(char **)malloc(2*sizeof(char*));
197 m[0]=(char *)malloc(end-start+2);
198 strncpy(m[0],text,end-start+1);
199 m[1]=NULL;
200 }
201 return m;
202 }
203
204 #ifndef HAVE_DYN_RL
fe_fgets_stdin_rl(const char * pr,char * s,int size)205 char * fe_fgets_stdin_rl(const char *pr,char *s, int size)
206 {
207 if (!BVERBOSE(V_PROMPT))
208 {
209 pr="";
210 }
211 mflush();
212
213 char *line;
214 line = readline (pr);
215
216 if (line==NULL)
217 return NULL;
218
219 int l=strlen(line);
220 for (int i=l-1;i>=0;i--) line[i]=line[i]&127;
221
222 if (*line!='\0')
223 {
224 add_history (line);
225 }
226 if (l>=size-1)
227 {
228 strncpy(s,line,size);
229 }
230 else
231 {
232 strncpy(s,line,l);
233 s[l]='\n';
234 s[l+1]='\0';
235 }
236 free (line);
237
238 return s;
239 }
240 #endif
241 #endif
242
243 /* ===================================================================*/
244 /* = emulated readline = */
245 /* ===================================================================*/
246 #if !defined(HAVE_READLINE) && defined(HAVE_FEREAD)
247 extern "C" {
248 char * fe_fgets_stdin_fe(const char *pr,char *s, int size);
249 }
fe_fgets_stdin_emu(const char * pr,char * s,int size)250 char * fe_fgets_stdin_emu(const char *pr,char *s, int size)
251 {
252 if (!BVERBOSE(V_PROMPT))
253 {
254 pr="";
255 }
256 mflush();
257 return fe_fgets_stdin_fe(pr,s,size);
258 }
259 #endif
260
261 /* ===================================================================*/
262 /* = dynamic readline = */
263 /* ===================================================================*/
264 /* some procedure are shared with "static readline" */
265 #if defined(HAVE_DYN_RL)
fe_fgets_stdin_drl(const char * pr,char * s,int size)266 char * fe_fgets_stdin_drl(const char *pr,char *s, int size)
267 {
268 if (!BVERBOSE(V_PROMPT))
269 {
270 pr="";
271 }
272 mflush();
273
274 char *line;
275 line = (*fe_readline) ((char*)pr);
276
277 if (line==NULL)
278 return NULL;
279
280 int l=strlen(line);
281 for (int i=l-1;i>=0;i--) line[i]=line[i]&127;
282
283 if (*line!='\0')
284 {
285 (*fe_add_history) (line);
286 }
287 if (l>=size-1)
288 {
289 strncpy(s,line,size);
290 }
291 else
292 {
293 strncpy(s,line,l);
294 s[l]='\n';
295 s[l+1]='\0';
296 }
297 free (line);
298
299 return s;
300 }
301 #endif
302
303 /* ===================================================================*/
304 /* = fgets = */
305 /* ===================================================================*/
fe_fgets(const char * pr,char * s,int size)306 char * fe_fgets(const char *pr,char *s, int size)
307 {
308 if (BVERBOSE(V_PROMPT))
309 {
310 fputs(pr,stdout);
311 }
312 mflush();
313 errno=0;
314 char *line=fgets(s,size,stdin);
315 if (line!=NULL)
316 {
317 for (int i=strlen(line)-1;i>=0;i--) line[i]=line[i]&127;
318 }
319 else
320 {
321 /* NULL can mean various things... */
322 switch(errno)
323 {
324 case 0: return NULL; /*EOF */
325 case EBADF: return NULL; /* stdin got closed */
326 case EINTR: return strcpy(s,"\n"); /* CTRL-C or other signal */
327 default: /* other error */
328 {
329 int errsv = errno;
330 fprintf(stderr,"fgets() failed with errno %d\n%s\n",errsv,strerror(errsv));
331 return NULL;
332 }
333 }
334 }
335 return line;
336 }
337
338 /* ===================================================================*/
339 /* = init for static rl, dyn. rl, emu. rl = */
340 /* ===================================================================*/
fe_fgets_stdin_init(const char * pr,char * s,int size)341 static char * fe_fgets_stdin_init(const char *pr,char *s, int size)
342 {
343 #if (defined(HAVE_READLINE) || defined(HAVE_LIBREADLINE)) && !defined(HAVE_DYN_RL) && !defined(HAVE_FEREAD)
344 /* Allow conditional parsing of the ~/.inputrc file. */
345 rl_readline_name = (char*)"Singular";
346 /* Tell the completer that we want a crack first. */
347 #ifdef USE_READLINE4
348 rl_attempted_completion_function = (rl_completion_func_t *)singular_completion;
349 #else
350 rl_attempted_completion_function = (CPPFunction *)singular_completion;
351 #endif
352
353 /* set the output stream */
354 if(!isatty(STDOUT_FILENO))
355 {
356 #ifdef atarist
357 rl_outstream = fopen( "/dev/tty", "w" );
358 #else
359 char *fn=ttyname(fileno(stdin));//if stdout is not a tty, maybe stdin is?
360 if (fn!=NULL) rl_outstream = fopen( fn, "w" );
361 #endif
362 }
363
364 if(isatty(fileno(stdin)))
365 {
366 /* try to read a history */
367 using_history();
368 char *p = getenv("SINGULARHIST");
369 if (p != NULL)
370 {
371 read_history (p);
372 }
373 fe_fgets_stdin=fe_fgets_stdin_rl;
374 return(fe_fgets_stdin_rl(pr,s,size));
375 }
376 else
377 {
378 fe_fgets_stdin=fe_fgets;
379 return(fe_fgets(pr,s,size));
380 }
381 #endif
382 #ifdef HAVE_DYN_RL
383 /* do dynamic loading */
384 int res=fe_init_dyn_rl();
385 if (res!=0)
386 {
387 //if (res==1)
388 // WarnS("dynamic loading of libreadline failed");
389 //else
390 // Warn("dynamic loading failed: %d\n",res);
391 if (res!=1)
392 Warn("dynamic loading failed: %d\n",res);
393 #ifdef HAVE_FEREAD
394 fe_fgets_stdin=fe_fgets_stdin_emu;
395 #else
396 fe_fgets_stdin=fe_fgets;
397 #endif
398 return fe_fgets_stdin(pr,s,size);
399 }
400 else if (isatty(STDIN_FILENO))/*and could load libreadline: */
401 {
402 /* Allow conditional parsing of the ~/.inputrc file. */
403 *fe_rl_readline_name = "Singular";
404 /* Tell the completer that we want a crack first. */
405 *fe_rl_attempted_completion_function = (CPPFunction *)singular_completion;
406 /* try to read a history */
407 (*fe_using_history)();
408 char *p = getenv("SINGULARHIST");
409 if (p != NULL)
410 {
411 (*fe_read_history) (p);
412 }
413
414 /* set the output stream */
415 if(!isatty(STDOUT_FILENO))
416 {
417 #ifdef atarist
418 *fe_rl_outstream = fopen( "/dev/tty", "w" );
419 #else
420 char *fn=ttyname(fileno(stdin));//if stdout is not a tty, maybe stdin is?
421 if (fn!=NULL) *fe_rl_outstream = fopen( fn, "w" );
422 #endif
423 }
424 fe_fgets_stdin=fe_fgets_stdin_drl;
425 return fe_fgets_stdin_drl(pr,s,size);
426 }
427 else
428 {
429 fe_fgets_stdin=fe_fgets;
430 return fe_fgets(pr,s,size);
431 }
432 #else
433 #if !defined(HAVE_READLINE) && defined(HAVE_FEREAD)
434 fe_fgets_stdin=fe_fgets_stdin_emu;
435 return(fe_fgets_stdin_emu(pr,s,size));
436 #else
437 fe_fgets_stdin=fe_fgets;
438 return(fe_fgets(pr,s,size));
439 #endif
440 #endif
441 }
442
443 /* ===================================================================*/
444 /* = batch mode = */
445 /* ===================================================================*/
446 /* dummy (for batch mode): */
fe_fgets_dummy(const char *,char *,int)447 char * fe_fgets_dummy(const char */*pr*/,char */*s*/, int /*size*/)
448 {
449 return NULL;
450 }
451
452