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feread.cc
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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 
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)
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"
50 char *command_generator (char *text, int state)
51 {
52  STATIC_VAR int list_index, len;
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 */
126  char *rl_filename_completion_function(const char*, int);
127  typedef char **CPPFunction ();
128 
129  extern char ** rl_completion_matches (const char*, RL_PROC);
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 */
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
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]=='"'))
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
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 }
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)
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 /* ===================================================================*/
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 /* ===================================================================*/
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
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  }
374  return(fe_fgets_stdin_rl(pr,s,size));
375  }
376  else
377  {
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
395  #else
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. */
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  }
425  return fe_fgets_stdin_drl(pr,s,size);
426  }
427  else
428  {
430  return fe_fgets(pr,s,size);
431  }
432 #else
433  #if !defined(HAVE_READLINE) && defined(HAVE_FEREAD)
435  return(fe_fgets_stdin_emu(pr,s,size));
436  #else
438  return(fe_fgets(pr,s,size));
439  #endif
440 #endif
441 }
442 
443 /* ===================================================================*/
444 /* = batch mode = */
445 /* ===================================================================*/
446 /* dummy (for batch mode): */
447 char * fe_fgets_dummy(const char */*pr*/,char */*s*/, int /*size*/)
448 {
449  return NULL;
450 }
451 
int size(const CanonicalForm &f, const Variable &v)
int size ( const CanonicalForm & f, const Variable & v )
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int l
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int m
Definition: cfEzgcd.cc:128
int i
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int p
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Definition: idrec.h:35
#define Warn
Definition: emacs.cc:77
const CanonicalForm int s
Definition: facAbsFact.cc:51
CanonicalForm res
Definition: facAbsFact.cc:60
char * getenv()
EXTERN_VAR CPPFunction * rl_attempted_completion_function
Definition: feread.cc:130
char * iiArithGetCmd(int)
Definition: iparith.cc:9779
EXTERN_VAR FILE * rl_outstream
Definition: feread.cc:131
char * fe_fgets_stdin_emu(const char *pr, char *s, int size)
Definition: feread.cc:250
VAR char ** fe_rl_readline_name
Definition: feread.cc:163
char ** singular_completion(char *text, int start, int end)
Definition: feread.cc:175
VAR char ** fe_rl_line_buffer
Definition: feread.cc:164
#define x_rl_filename_completion_function
VAR int(* fe_read_history)(char *)
Definition: feread.cc:171
char ** CPPFunction()
Definition: feread.cc:127
char ** RL_CPPFunction(const char *, int, int)
Definition: feread.cc:142
VAR int(* fe_write_history)()
Definition: feread.cc:168
#define x_rl_completion_matches
char *(* RL_PROC)(const char *, int)
Definition: feread.cc:104
static char * fe_fgets_stdin_init(const char *pr, char *s, int size)
Definition: feread.cc:341
VAR void(* fe_using_history)()
Definition: feread.cc:170
char *(* fe_fgets_stdin)(const char *pr, char *s, int size)
Definition: feread.cc:30
char * fe_fgets(const char *pr, char *s, int size)
Definition: feread.cc:306
VAR CPPFunction ** fe_rl_attempted_completion_function
Definition: feread.cc:166
#define x_rl_line_buffer
VAR int(* fe_history_total_bytes)()
Definition: feread.cc:169
char * command_generator(char *text, int state)
Definition: feread.cc:50
int read_history(char *)
char * fe_fgets_stdin_drl(const char *pr, char *s, int size)
Definition: feread.cc:266
#define rl_completion_matches
Definition: feread.cc:120
char * fe_fgets_stdin_fe(const char *pr, char *s, int size)
void add_history(char *)
EXTERN_VAR char * rl_line_buffer
Definition: feread.cc:125
char * fe_fgets_stdin_rl(const char *pr, char *s, int size)
#define STDOUT_FILENO
Definition: feread.cc:41
#define rl_filename_completion_function
Definition: feread.cc:119
int history_total_bytes()
VAR void(* fe_add_history)(char *)
Definition: feread.cc:162
EXTERN_VAR char * rl_readline_name
Definition: feread.cc:124
void using_history()
char * fe_fgets_dummy(const char *, char *, int)
Definition: feread.cc:447
VAR FILE ** fe_rl_outstream
Definition: feread.cc:167
int write_history()
char * readline(const char *)
int fe_init_dyn_rl()
Definition: fereadl.c:755
#define STDIN_FILENO
Definition: fereadl.c:51
#define STATIC_VAR
Definition: globaldefs.h:7
#define EXTERN_VAR
Definition: globaldefs.h:6
#define VAR
Definition: globaldefs.h:5
VAR package basePack
Definition: ipid.cc:58
STATIC_VAR Poly * h
Definition: janet.cc:971
#define free
Definition: omAllocFunc.c:14
#define strdup
Definition: omAllocFunc.c:18
#define NULL
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void * malloc(size_t size)
Definition: omalloc.c:85
#define BVERBOSE(a)
Definition: options.h:34
#define V_PROMPT
Definition: options.h:53
#define mflush()
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int name
New type name for int.
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