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sd: remove 'ssd' driver support
[unleashed/tickless.git] / usr / src / lib / libshell / common / edit / history.c
blob4cc7c01a219702e72beecbe48d5ecc89de1e5132
1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1982-2010 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Common Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.opensource.org/licenses/cpl1.0.txt *
11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * David Korn <dgk@research.att.com> *
18 * *
19 ***********************************************************************/
20 #pragma prototyped
21 /*
22 * History file manipulation routines
23 *
24 * David Korn
25 * AT&T Labs
26 *
27 */
28
29 /*
30 * Each command in the history file starts on an even byte is null terminated.
31 * The first byte must contain the special character HIST_UNDO and the second
32 * byte is the version number. The sequence HIST_UNDO 0, following a command,
33 * nullifies the previous command. A six byte sequence starting with
34 * HIST_CMDNO is used to store the command number so that it is not necessary
35 * to read the file from beginning to end to get to the last block of
36 * commands. This format of this sequence is different in version 1
37 * then in version 0. Version 1 allows commands to use the full 8 bit
38 * character set. It can understand version 0 format files.
39 */
40
41
42 #define HIST_MAX (sizeof(int)*HIST_BSIZE)
43 #define HIST_BIG (0100000-1024) /* 1K less than maximum short */
44 #define HIST_LINE 32 /* typical length for history line */
45 #define HIST_MARKSZ 6
46 #define HIST_RECENT 600
47 #define HIST_UNDO 0201 /* invalidate previous command */
48 #define HIST_CMDNO 0202 /* next 3 bytes give command number */
49 #define HIST_BSIZE 4096 /* size of history file buffer */
50 #define HIST_DFLT 512 /* default size of history list */
51
52 #if SHOPT_AUDIT
53 # define _HIST_AUDIT Sfio_t *auditfp; \
54 char *tty; \
55 int auditmask;
56 #else
57 # define _HIST_AUDIT
58 #endif
59
60 #define _HIST_PRIVATE \
61 void *histshell; \
62 off_t histcnt; /* offset into history file */\
63 off_t histmarker; /* offset of last command marker */ \
64 int histflush; /* set if flushed outside of hflush() */\
65 int histmask; /* power of two mask for histcnt */ \
66 char histbuff[HIST_BSIZE+1]; /* history file buffer */ \
67 int histwfail; \
68 _HIST_AUDIT \
69 off_t histcmds[2]; /* offset for recent commands, must be last */
70
71 #define hist_ind(hp,c) ((int)((c)&(hp)->histmask))
72
73 #include <ast.h>
74 #include <sfio.h>
75 #include "FEATURE/time"
76 #include <error.h>
77 #include <ls.h>
78 #if KSHELL
79 # include "defs.h"
80 # include "variables.h"
81 # include "path.h"
82 # include "builtins.h"
83 # include "io.h"
84 #else
85 # include <ctype.h>
86 #endif /* KSHELL */
87 #include "history.h"
88
89 #if !KSHELL
90 # define new_of(type,x) ((type*)malloc((unsigned)sizeof(type)+(x)))
91 # define NIL(type) ((type)0)
92 # define path_relative(x) (x)
93 # ifdef __STDC__
94 # define nv_getval(s) getenv(#s)
95 # else
96 # define nv_getval(s) getenv("s")
97 # endif /* __STDC__ */
98 # define e_unknown "unknown"
99 # define sh_translate(x) (x)
100 char login_sh = 0;
101 char hist_fname[] = "/.history";
102 #endif /* KSHELL */
103
104 #ifndef O_BINARY
105 # define O_BINARY 0
106 #endif /* O_BINARY */
107
108 int _Hist = 0;
109 static void hist_marker(char*,long);
110 static History_t* hist_trim(History_t*, int);
111 static int hist_nearend(History_t*,Sfio_t*, off_t);
112 static int hist_check(int);
113 static int hist_clean(int);
114 #ifdef SF_BUFCONST
115 static ssize_t hist_write(Sfio_t*, const void*, size_t, Sfdisc_t*);
116 static int hist_exceptf(Sfio_t*, int, void*, Sfdisc_t*);
117 #else
118 static int hist_write(Sfio_t*, const void*, int, Sfdisc_t*);
119 static int hist_exceptf(Sfio_t*, int, Sfdisc_t*);
120 #endif
121
122
123 static int histinit;
124 static mode_t histmode;
125 static History_t *wasopen;
126 static History_t *hist_ptr;
127
128 #if SHOPT_ACCTFILE
129 static int acctfd;
130 static char *logname;
131 # include <pwd.h>
132
133 static int acctinit(History_t *hp)
134 {
135 register char *cp, *acctfile;
136 Namval_t *np = nv_search("ACCTFILE",((Shell_t*)hp->histshell)->var_tree,0);
137
138 if(!np || !(acctfile=nv_getval(np)))
139 return(0);
140 if(!(cp = getlogin()))
141 {
142 struct passwd *userinfo = getpwuid(getuid());
143 if(userinfo)
144 cp = userinfo->pw_name;
145 else
146 cp = "unknown";
147 }
148 logname = strdup(cp);
149 if((acctfd=sh_open(acctfile,
150 O_BINARY|O_WRONLY|O_APPEND|O_CREAT,S_IRUSR|S_IWUSR))>=0 &&
151 (unsigned)acctfd < 10)
152 {
153 int n;
154 if((n = fcntl(acctfd, F_DUPFD, 10)) >= 0)
155 {
156 close(acctfd);
157 acctfd = n;
158 }
159 }
160 if(acctfd < 0)
161 {
162 acctfd = 0;
163 return(0);
164 }
165 if(strmatch(acctfile,e_devfdNN))
166 {
167 char newfile[16];
168 sfsprintf(newfile,sizeof(newfile),"%.8s%d\0",e_devfdNN,acctfd);
169 nv_putval(np,newfile,NV_RDONLY);
170 }
171 else
172 fcntl(acctfd,F_SETFD,FD_CLOEXEC);
173 return(1);
174 }
175 #endif /* SHOPT_ACCTFILE */
176
177 #if SHOPT_AUDIT
178 static int sh_checkaudit(History_t *hp, const char *name, char *logbuf, size_t len)
179 {
180 Shell_t *shp = (Shell_t*)hp->histshell;
181 char *buff, *cp, *last;
182 int id1, id2, r=0, n, fd;
183 if((fd=open(name, O_RDONLY)) < 0)
184 return(0);
185 if((n = read(fd, logbuf,len-1)) < 0)
186 goto done;
187 while(logbuf[n-1]=='\n')
188 n--;
189 logbuf[n] = 0;
190 if(!(cp=strchr(logbuf,';')) && !(cp=strchr(logbuf,' ')))
191 goto done;
192 *cp = 0;
193 do
194 {
195 cp++;
196 id1 = id2 = strtol(cp,&last,10);
197 if(*last=='-')
198 id1 = strtol(last+1,&last,10);
199 if(shp->euserid >=id1 && shp->euserid <= id2)
200 r |= 1;
201 if(shp->userid >=id1 && shp->userid <= id2)
202 r |= 2;
203 cp = last;
204 }
205 while(*cp==';' || *cp==' ');
206 done:
207 close(fd);
208 return(r);
209
210 }
211 #endif /*SHOPT_AUDIT*/
212
213 static const unsigned char hist_stamp[2] = { HIST_UNDO, HIST_VERSION };
214 static const Sfdisc_t hist_disc = { NULL, hist_write, NULL, hist_exceptf, NULL};
215
216 static void hist_touch(void *handle)
217 {
218 touch((char*)handle, (time_t)0, (time_t)0, 0);
219 }
220
221 /*
222 * open the history file
223 * if HISTNAME is not given and userid==0 then no history file.
224 * if login_sh and HISTFILE is longer than HIST_MAX bytes then it is
225 * cleaned up.
226 * hist_open() returns 1, if history file is open
227 */
228 int sh_histinit(void *sh_context)
229 {
230 Shell_t *shp = (Shell_t*)sh_context;
231 register int fd;
232 register History_t *hp;
233 register char *histname;
234 char *fname=0;
235 int histmask, maxlines, hist_start=0;
236 register char *cp;
237 register off_t hsize = 0;
238
239 if(shp->hist_ptr=hist_ptr)
240 return(1);
241 if(!(histname = nv_getval(HISTFILE)))
242 {
243 int offset = staktell();
244 if(cp=nv_getval(HOME))
245 stakputs(cp);
246 stakputs(hist_fname);
247 stakputc(0);
248 stakseek(offset);
249 histname = stakptr(offset);
250 }
251 #ifdef future
252 if(hp=wasopen)
253 {
254 /* reuse history file if same name */
255 wasopen = 0;
256 shp->hist_ptr = hist_ptr = hp;
257 if(strcmp(histname,hp->histname)==0)
258 return(1);
259 else
260 hist_free();
261 }
262 #endif
263 retry:
264 cp = path_relative(histname);
265 if(!histinit)
266 histmode = S_IRUSR|S_IWUSR;
267 if((fd=open(cp,O_BINARY|O_APPEND|O_RDWR|O_CREAT,histmode))>=0)
268 {
269 hsize=lseek(fd,(off_t)0,SEEK_END);
270 }
271 if((unsigned)fd <=2)
272 {
273 int n;
274 if((n=fcntl(fd,F_DUPFD,10))>=0)
275 {
276 close(fd);
277 fd=n;
278 }
279 }
280 /* make sure that file has history file format */
281 if(hsize && hist_check(fd))
282 {
283 close(fd);
284 hsize = 0;
285 if(unlink(cp)>=0)
286 goto retry;
287 fd = -1;
288 }
289 if(fd < 0)
290 {
291 #if KSHELL
292 /* don't allow root a history_file in /tmp */
293 if(shp->userid)
294 #endif /* KSHELL */
295 {
296 if(!(fname = pathtmp(NIL(char*),0,0,NIL(int*))))
297 return(0);
298 fd = open(fname,O_BINARY|O_APPEND|O_CREAT|O_RDWR,S_IRUSR|S_IWUSR);
299 }
300 }
301 if(fd<0)
302 return(0);
303 /* set the file to close-on-exec */
304 fcntl(fd,F_SETFD,FD_CLOEXEC);
305 if(cp=nv_getval(HISTSIZE))
306 maxlines = (unsigned)strtol(cp, (char**)0, 10);
307 else
308 maxlines = HIST_DFLT;
309 for(histmask=16;histmask <= maxlines; histmask <<=1 );
310 if(!(hp=new_of(History_t,(--histmask)*sizeof(off_t))))
311 {
312 close(fd);
313 return(0);
314 }
315 shp->hist_ptr = hist_ptr = hp;
316 hp->histshell = (void*)shp;
317 hp->histsize = maxlines;
318 hp->histmask = histmask;
319 hp->histfp= sfnew(NIL(Sfio_t*),hp->histbuff,HIST_BSIZE,fd,SF_READ|SF_WRITE|SF_APPENDWR|SF_SHARE);
320 memset((char*)hp->histcmds,0,sizeof(off_t)*(hp->histmask+1));
321 hp->histind = 1;
322 hp->histcmds[1] = 2;
323 hp->histcnt = 2;
324 hp->histname = strdup(histname);
325 hp->histdisc = hist_disc;
326 if(hsize==0)
327 {
328 /* put special characters at front of file */
329 sfwrite(hp->histfp,(char*)hist_stamp,2);
330 sfsync(hp->histfp);
331 }
332 /* initialize history list */
333 else
334 {
335 int first,last;
336 off_t mark,size = (HIST_MAX/4)+maxlines*HIST_LINE;
337 hp->histind = first = hist_nearend(hp,hp->histfp,hsize-size);
338 hist_eof(hp); /* this sets histind to last command */
339 if((hist_start = (last=(int)hp->histind)-maxlines) <=0)
340 hist_start = 1;
341 mark = hp->histmarker;
342 while(first > hist_start)
343 {
344 size += size;
345 first = hist_nearend(hp,hp->histfp,hsize-size);
346 hp->histind = first;
347 }
348 histinit = hist_start;
349 hist_eof(hp);
350 if(!histinit)
351 {
352 sfseek(hp->histfp,hp->histcnt=hsize,SEEK_SET);
353 hp->histind = last;
354 hp->histmarker = mark;
355 }
356 histinit = 0;
357 }
358 if(fname)
359 {
360 unlink(fname);
361 free((void*)fname);
362 }
363 if(hist_clean(fd) && hist_start>1 && hsize > HIST_MAX)
364 {
365 #ifdef DEBUG
366 sfprintf(sfstderr,"%d: hist_trim hsize=%d\n",getpid(),hsize);
367 sfsync(sfstderr);
368 #endif /* DEBUG */
369 hp = hist_trim(hp,(int)hp->histind-maxlines);
370 }
371 sfdisc(hp->histfp,&hp->histdisc);
372 #if KSHELL
373 (HISTCUR)->nvalue.lp = (&hp->histind);
374 #endif /* KSHELL */
375 sh_timeradd(1000L*(HIST_RECENT-30), 1, hist_touch, (void*)hp->histname);
376 #if SHOPT_ACCTFILE
377 if(sh_isstate(SH_INTERACTIVE))
378 acctinit(hp);
379 #endif /* SHOPT_ACCTFILE */
380 #if SHOPT_AUDIT
381 {
382 char buff[SF_BUFSIZE];
383 hp->auditfp = 0;
384 if(sh_isstate(SH_INTERACTIVE) && (hp->auditmask=sh_checkaudit(hp,SHOPT_AUDITFILE, buff, sizeof(buff))))
385 {
386 if((fd=sh_open(buff,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,S_IRUSR|S_IWUSR))>=0 && fd < 10)
387 {
388 int n;
389 if((n = sh_fcntl(fd,F_DUPFD, 10)) >= 0)
390 {
391 sh_close(fd);
392 fd = n;
393 }
394 }
395 if(fd>=0)
396 {
397 hp->tty = strdup(ttyname(2));
398 hp->auditfp = sfnew((Sfio_t*)0,NULL,-1,fd,SF_WRITE);
399 }
400 }
401 }
402 #endif
403 return(1);
404 }
405
406 /*
407 * close the history file and free the space
408 */
409
410 void hist_close(register History_t *hp)
411 {
412 Shell_t *shp = (Shell_t*)hp->histshell;
413 sfclose(hp->histfp);
414 #if SHOPT_AUDIT
415 if(hp->auditfp)
416 {
417 if(hp->tty)
418 free((void*)hp->tty);
419 sfclose(hp->auditfp);
420 }
421 #endif /* SHOPT_AUDIT */
422 free((char*)hp);
423 hist_ptr = 0;
424 shp->hist_ptr = 0;
425 #if SHOPT_ACCTFILE
426 if(acctfd)
427 {
428 close(acctfd);
429 acctfd = 0;
430 }
431 #endif /* SHOPT_ACCTFILE */
432 }
433
434 /*
435 * check history file format to see if it begins with special byte
436 */
437 static int hist_check(register int fd)
438 {
439 unsigned char magic[2];
440 lseek(fd,(off_t)0,SEEK_SET);
441 if((read(fd,(char*)magic,2)!=2) || (magic[0]!=HIST_UNDO))
442 return(1);
443 return(0);
444 }
445
446 /*
447 * clean out history file OK if not modified in HIST_RECENT seconds
448 */
449 static int hist_clean(int fd)
450 {
451 struct stat statb;
452 return(fstat(fd,&statb)>=0 && (time((time_t*)0)-statb.st_mtime) >= HIST_RECENT);
453 }
454
455 /*
456 * Copy the last <n> commands to a new file and make this the history file
457 */
458
459 static History_t* hist_trim(History_t *hp, int n)
460 {
461 register char *cp;
462 register int incmd=1, c=0;
463 register History_t *hist_new, *hist_old = hp;
464 char *buff, *endbuff, *tmpname=0;
465 off_t oldp,newp;
466 struct stat statb;
467 unlink(hist_old->histname);
468 if(access(hist_old->histname,F_OK) >= 0)
469 {
470 /* The unlink can fail on windows 95 */
471 int fd;
472 char *last, *name=hist_old->histname;
473 close(sffileno(hist_old->histfp));
474 tmpname = (char*)malloc(strlen(name)+14);
475 if(last = strrchr(name,'/'))
476 {
477 *last = 0;
478 pathtmp(tmpname,name,"hist",NIL(int*));
479 *last = '/';
480 }
481 else
482 pathtmp(tmpname,".","hist",NIL(int*));
483 if(rename(name,tmpname) < 0)
484 tmpname = name;
485 fd = open(tmpname,O_RDONLY);
486 sfsetfd(hist_old->histfp,fd);
487 if(tmpname==name)
488 tmpname = 0;
489 }
490 hist_ptr = 0;
491 if(fstat(sffileno(hist_old->histfp),&statb)>=0)
492 {
493 histinit = 1;
494 histmode = statb.st_mode;
495 }
496 if(!sh_histinit(hp->histshell))
497 {
498 /* use the old history file */
499 return hist_ptr = hist_old;
500 }
501 hist_new = hist_ptr;
502 hist_ptr = hist_old;
503 if(--n < 0)
504 n = 0;
505 newp = hist_seek(hist_old,++n);
506 while(1)
507 {
508 if(!incmd)
509 {
510 c = hist_ind(hist_new,++hist_new->histind);
511 hist_new->histcmds[c] = hist_new->histcnt;
512 if(hist_new->histcnt > hist_new->histmarker+HIST_BSIZE/2)
513 {
514 char locbuff[HIST_MARKSZ];
515 hist_marker(locbuff,hist_new->histind);
516 sfwrite(hist_new->histfp,locbuff,HIST_MARKSZ);
517 hist_new->histcnt += HIST_MARKSZ;
518 hist_new->histmarker = hist_new->histcmds[hist_ind(hist_new,c)] = hist_new->histcnt;
519 }
520 oldp = newp;
521 newp = hist_seek(hist_old,++n);
522 if(newp <=oldp)
523 break;
524 }
525 if(!(buff=(char*)sfreserve(hist_old->histfp,SF_UNBOUND,0)))
526 break;
527 *(endbuff=(cp=buff)+sfvalue(hist_old->histfp)) = 0;
528 /* copy to null byte */
529 incmd = 0;
530 while(*cp++);
531 if(cp > endbuff)
532 incmd = 1;
533 else if(*cp==0)
534 cp++;
535 if(cp > endbuff)
536 cp = endbuff;
537 c = cp-buff;
538 hist_new->histcnt += c;
539 sfwrite(hist_new->histfp,buff,c);
540 }
541 hist_cancel(hist_new);
542 sfclose(hist_old->histfp);
543 if(tmpname)
544 {
545 unlink(tmpname);
546 free(tmpname);
547 }
548 free((char*)hist_old);
549 return hist_ptr = hist_new;
550 }
551
552 /*
553 * position history file at size and find next command number
554 */
555 static int hist_nearend(History_t *hp, Sfio_t *iop, register off_t size)
556 {
557 register unsigned char *cp, *endbuff;
558 register int n, incmd=1;
559 unsigned char *buff, marker[4];
560 if(size <= 2L || sfseek(iop,size,SEEK_SET)<0)
561 goto begin;
562 /* skip to marker command and return the number */
563 /* numbering commands occur after a null and begin with HIST_CMDNO */
564 while(cp=buff=(unsigned char*)sfreserve(iop,SF_UNBOUND,SF_LOCKR))
565 {
566 n = sfvalue(iop);
567 *(endbuff=cp+n) = 0;
568 while(1)
569 {
570 /* check for marker */
571 if(!incmd && *cp++==HIST_CMDNO && *cp==0)
572 {
573 n = cp+1 - buff;
574 incmd = -1;
575 break;
576 }
577 incmd = 0;
578 while(*cp++);
579 if(cp>endbuff)
580 {
581 incmd = 1;
582 break;
583 }
584 if(*cp==0 && ++cp>endbuff)
585 break;
586 }
587 size += n;
588 sfread(iop,(char*)buff,n);
589 if(incmd < 0)
590 {
591 if((n=sfread(iop,(char*)marker,4))==4)
592 {
593 n = (marker[0]<<16)|(marker[1]<<8)|marker[2];
594 if(n < size/2)
595 {
596 hp->histmarker = hp->histcnt = size+4;
597 return(n);
598 }
599 n=4;
600 }
601 if(n >0)
602 size += n;
603 incmd = 0;
604 }
605 }
606 begin:
607 sfseek(iop,(off_t)2,SEEK_SET);
608 hp->histmarker = hp->histcnt = 2L;
609 return(1);
610 }
611
612 /*
613 * This routine reads the history file from the present position
614 * to the end-of-file and puts the information in the in-core
615 * history table
616 * Note that HIST_CMDNO is only recognized at the beginning of a command
617 * and that HIST_UNDO as the first character of a command is skipped
618 * unless it is followed by 0. If followed by 0 then it cancels
619 * the previous command.
620 */
621
622 void hist_eof(register History_t *hp)
623 {
624 register char *cp,*first,*endbuff;
625 register int incmd = 0;
626 register off_t count = hp->histcnt;
627 int n,skip=0;
628 sfseek(hp->histfp,count,SEEK_SET);
629 while(cp=(char*)sfreserve(hp->histfp,SF_UNBOUND,0))
630 {
631 n = sfvalue(hp->histfp);
632 *(endbuff = cp+n) = 0;
633 first = cp += skip;
634 while(1)
635 {
636 while(!incmd)
637 {
638 if(cp>first)
639 {
640 count += (cp-first);
641 n = hist_ind(hp, ++hp->histind);
642 #ifdef future
643 if(count==hp->histcmds[n])
644 {
645 sfprintf(sfstderr,"count match n=%d\n",n);
646 if(histinit)
647 {
648 histinit = 0;
649 return;
650 }
651 }
652 else if(n>=histinit)
653 #endif
654 hp->histcmds[n] = count;
655 first = cp;
656 }
657 switch(*((unsigned char*)(cp++)))
658 {
659 case HIST_CMDNO:
660 if(*cp==0)
661 {
662 hp->histmarker=count+2;
663 cp += (HIST_MARKSZ-1);
664 hp->histind--;
665 #ifdef future
666 if(cp <= endbuff)
667 {
668 unsigned char *marker = (unsigned char*)(cp-4);
669 int n = ((marker[0]<<16)
670 |(marker[1]<<8)|marker[2]);
671 if((n<count/2) && n != (hp->histind+1))
672 errormsg(SH_DICT,2,"index=%d marker=%d", hp->histind, n);
673 }
674 #endif
675 }
676 break;
677 case HIST_UNDO:
678 if(*cp==0)
679 {
680 cp+=1;
681 hp->histind-=2;
682 }
683 break;
684 default:
685 cp--;
686 incmd = 1;
687 }
688 if(cp > endbuff)
689 {
690 cp++;
691 goto refill;
692 }
693 }
694 first = cp;
695 while(*cp++);
696 if(cp > endbuff)
697 break;
698 incmd = 0;
699 while(*cp==0)
700 {
701 if(++cp > endbuff)
702 goto refill;
703 }
704 }
705 refill:
706 count += (--cp-first);
707 skip = (cp-endbuff);
708 if(!incmd && !skip)
709 hp->histcmds[hist_ind(hp,++hp->histind)] = count;
710 }
711 hp->histcnt = count;
712 }
713
714 /*
715 * This routine will cause the previous command to be cancelled
716 */
717
718 void hist_cancel(register History_t *hp)
719 {
720 register int c;
721 if(!hp)
722 return;
723 sfputc(hp->histfp,HIST_UNDO);
724 sfputc(hp->histfp,0);
725 sfsync(hp->histfp);
726 hp->histcnt += 2;
727 c = hist_ind(hp,--hp->histind);
728 hp->histcmds[c] = hp->histcnt;
729 }
730
731 /*
732 * flush the current history command
733 */
734
735 void hist_flush(register History_t *hp)
736 {
737 register char *buff;
738 if(hp)
739 {
740 if(buff=(char*)sfreserve(hp->histfp,0,SF_LOCKR))
741 {
742 hp->histflush = sfvalue(hp->histfp)+1;
743 sfwrite(hp->histfp,buff,0);
744 }
745 else
746 hp->histflush=0;
747 if(sfsync(hp->histfp)<0)
748 {
749 hist_close(hp);
750 if(!sh_histinit(hp->histshell))
751 sh_offoption(SH_HISTORY);
752 }
753 hp->histflush = 0;
754 }
755 }
756
757 /*
758 * This is the write discipline for the history file
759 * When called from hist_flush(), trailing newlines are deleted and
760 * a zero byte. Line sequencing is added as required
761 */
762
763 #ifdef SF_BUFCONST
764 static ssize_t hist_write(Sfio_t *iop,const void *buff,register size_t insize,Sfdisc_t* handle)
765 #else
766 static int hist_write(Sfio_t *iop,const void *buff,register int insize,Sfdisc_t* handle)
767 #endif
768 {
769 register History_t *hp = (History_t*)handle;
770 register char *bufptr = ((char*)buff)+insize;
771 register int c,size = insize;
772 register off_t cur;
773 int saved=0;
774 char saveptr[HIST_MARKSZ];
775 if(!hp->histflush)
776 return(write(sffileno(iop),(char*)buff,size));
777 if((cur = lseek(sffileno(iop),(off_t)0,SEEK_END)) <0)
778 {
779 errormsg(SH_DICT,2,"hist_flush: EOF seek failed errno=%d",errno);
780 return(-1);
781 }
782 hp->histcnt = cur;
783 /* remove whitespace from end of commands */
784 while(--bufptr >= (char*)buff)
785 {
786 c= *bufptr;
787 if(!isspace(c))
788 {
789 if(c=='\\' && *(bufptr+1)!='\n')
790 bufptr++;
791 break;
792 }
793 }
794 /* don't count empty lines */
795 if(++bufptr <= (char*)buff)
796 return(insize);
797 *bufptr++ = '\n';
798 *bufptr++ = 0;
799 size = bufptr - (char*)buff;
800 #if SHOPT_AUDIT
801 if(hp->auditfp)
802 {
803 Shell_t *shp = (Shell_t*)hp->histshell;
804 time_t t=time((time_t*)0);
805 sfprintf(hp->auditfp,"%u;%u;%s;%*s%c",sh_isoption(SH_PRIVILEGED)?shp->euserid:shp->userid,t,hp->tty,size,buff,0);
806 sfsync(hp->auditfp);
807 }
808 #endif /* SHOPT_AUDIT */
809 #if SHOPT_ACCTFILE
810 if(acctfd)
811 {
812 int timechars, offset;
813 offset = staktell();
814 stakputs(buff);
815 stakseek(staktell() - 1);
816 timechars = sfprintf(staksp, "\t%s\t%x\n",logname,time(NIL(long *)));
817 lseek(acctfd, (off_t)0, SEEK_END);
818 write(acctfd, stakptr(offset), size - 2 + timechars);
819 stakseek(offset);
820
821 }
822 #endif /* SHOPT_ACCTFILE */
823 if(size&01)
824 {
825 size++;
826 *bufptr++ = 0;
827 }
828 hp->histcnt += size;
829 c = hist_ind(hp,++hp->histind);
830 hp->histcmds[c] = hp->histcnt;
831 if(hp->histflush>HIST_MARKSZ && hp->histcnt > hp->histmarker+HIST_BSIZE/2)
832 {
833 memcpy((void*)saveptr,(void*)bufptr,HIST_MARKSZ);
834 saved=1;
835 hp->histcnt += HIST_MARKSZ;
836 hist_marker(bufptr,hp->histind);
837 hp->histmarker = hp->histcmds[hist_ind(hp,c)] = hp->histcnt;
838 size += HIST_MARKSZ;
839 }
840 errno = 0;
841 size = write(sffileno(iop),(char*)buff,size);
842 if(saved)
843 memcpy((void*)bufptr,(void*)saveptr,HIST_MARKSZ);
844 if(size>=0)
845 {
846 hp->histwfail = 0;
847 return(insize);
848 }
849 return(-1);
850 }
851
852 /*
853 * Put history sequence number <n> into buffer <buff>
854 * The buffer must be large enough to hold HIST_MARKSZ chars
855 */
856
857 static void hist_marker(register char *buff,register long cmdno)
858 {
859 *buff++ = HIST_CMDNO;
860 *buff++ = 0;
861 *buff++ = (cmdno>>16);
862 *buff++ = (cmdno>>8);
863 *buff++ = cmdno;
864 *buff++ = 0;
865 }
866
867 /*
868 * return byte offset in history file for command <n>
869 */
870 off_t hist_tell(register History_t *hp, int n)
871 {
872 return(hp->histcmds[hist_ind(hp,n)]);
873 }
874
875 /*
876 * seek to the position of command <n>
877 */
878 off_t hist_seek(register History_t *hp, int n)
879 {
880 return(sfseek(hp->histfp,hp->histcmds[hist_ind(hp,n)],SEEK_SET));
881 }
882
883 /*
884 * write the command starting at offset <offset> onto file <outfile>.
885 * if character <last> appears before newline it is deleted
886 * each new-line character is replaced with string <nl>.
887 */
888
889 void hist_list(register History_t *hp,Sfio_t *outfile, off_t offset,int last, char *nl)
890 {
891 register int oldc=0;
892 register int c;
893 if(offset<0 || !hp)
894 {
895 sfputr(outfile,sh_translate(e_unknown),'\n');
896 return;
897 }
898 sfseek(hp->histfp,offset,SEEK_SET);
899 while((c = sfgetc(hp->histfp)) != EOF)
900 {
901 if(c && oldc=='\n')
902 sfputr(outfile,nl,-1);
903 else if(last && (c==0 || (c=='\n' && oldc==last)))
904 return;
905 else if(oldc)
906 sfputc(outfile,oldc);
907 oldc = c;
908 if(c==0)
909 return;
910 }
911 return;
912 }
913
914 /*
915 * find index for last line with given string
916 * If flag==0 then line must begin with string
917 * direction < 1 for backwards search
918 */
919
920 Histloc_t hist_find(register History_t*hp,char *string,register int index1,int flag,int direction)
921 {
922 register int index2;
923 off_t offset;
924 int *coffset=0;
925 Histloc_t location;
926 location.hist_command = -1;
927 location.hist_char = 0;
928 location.hist_line = 0;
929 if(!hp)
930 return(location);
931 /* leading ^ means beginning of line unless escaped */
932 if(flag)
933 {
934 index2 = *string;
935 if(index2=='\\')
936 string++;
937 else if(index2=='^')
938 {
939 flag=0;
940 string++;
941 }
942 }
943 if(flag)
944 coffset = &location.hist_char;
945 index2 = (int)hp->histind;
946 if(direction<0)
947 {
948 index2 -= hp->histsize;
949 if(index2<1)
950 index2 = 1;
951 if(index1 <= index2)
952 return(location);
953 }
954 else if(index1 >= index2)
955 return(location);
956 while(index1!=index2)
957 {
958 direction>0?++index1:--index1;
959 offset = hist_tell(hp,index1);
960 if((location.hist_line=hist_match(hp,offset,string,coffset))>=0)
961 {
962 location.hist_command = index1;
963 return(location);
964 }
965 #if KSHELL
966 /* allow a search to be aborted */
967 if(((Shell_t*)hp->histshell)->trapnote&SH_SIGSET)
968 break;
969 #endif /* KSHELL */
970 }
971 return(location);
972 }
973
974 /*
975 * search for <string> in history file starting at location <offset>
976 * If coffset==0 then line must begin with string
977 * returns the line number of the match if successful, otherwise -1
978 */
979
980 int hist_match(register History_t *hp,off_t offset,char *string,int *coffset)
981 {
982 register unsigned char *first, *cp;
983 register int m,n,c=1,line=0;
984 #if SHOPT_MULTIBYTE
985 mbinit();
986 #endif /* SHOPT_MULTIBYTE */
987 sfseek(hp->histfp,offset,SEEK_SET);
988 if(!(cp = first = (unsigned char*)sfgetr(hp->histfp,0,0)))
989 return(-1);
990 m = sfvalue(hp->histfp);
991 n = strlen(string);
992 while(m > n)
993 {
994 if(*cp==*string && memcmp(cp,string,n)==0)
995 {
996 if(coffset)
997 *coffset = (cp-first);
998 return(line);
999 }
1000 if(!coffset)
1001 break;
1002 if(*cp=='\n')
1003 line++;
1004 #if SHOPT_MULTIBYTE
1005 if((c=mbsize(cp)) < 0)
1006 c = 1;
1007 #endif /* SHOPT_MULTIBYTE */
1008 cp += c;
1009 m -= c;
1010 }
1011 return(-1);
1012 }
1013
1014
1015 #if SHOPT_ESH || SHOPT_VSH
1016 /*
1017 * copy command <command> from history file to s1
1018 * at most <size> characters copied
1019 * if s1==0 the number of lines for the command is returned
1020 * line=linenumber for emacs copy and only this line of command will be copied
1021 * line < 0 for full command copy
1022 * -1 returned if there is no history file
1023 */
1024
1025 int hist_copy(char *s1,int size,int command,int line)
1026 {
1027 register int c;
1028 register History_t *hp = sh_getinterp()->hist_ptr;
1029 register int count = 0;
1030 register char *s1max = s1+size;
1031 if(!hp)
1032 return(-1);
1033 hist_seek(hp,command);
1034 while ((c = sfgetc(hp->histfp)) && c!=EOF)
1035 {
1036 if(c=='\n')
1037 {
1038 if(count++ ==line)
1039 break;
1040 else if(line >= 0)
1041 continue;
1042 }
1043 if(s1 && (line<0 || line==count))
1044 {
1045 if(s1 >= s1max)
1046 {
1047 *--s1 = 0;
1048 break;
1049 }
1050 *s1++ = c;
1051 }
1052
1053 }
1054 sfseek(hp->histfp,(off_t)0,SEEK_END);
1055 if(s1==0)
1056 return(count);
1057 if(count && (c= *(s1-1)) == '\n')
1058 s1--;
1059 *s1 = '\0';
1060 return(count);
1061 }
1062
1063 /*
1064 * return word number <word> from command number <command>
1065 */
1066
1067 char *hist_word(char *string,int size,int word)
1068 {
1069 register int c;
1070 register char *s1 = string;
1071 register unsigned char *cp = (unsigned char*)s1;
1072 register int flag = 0;
1073 History_t *hp = hist_ptr;
1074 if(!hp)
1075 return(NIL(char*));
1076 hist_copy(string,size,(int)hp->histind-1,-1);
1077 for(;c = *cp;cp++)
1078 {
1079 c = isspace(c);
1080 if(c && flag)
1081 {
1082 *cp = 0;
1083 if(--word==0)
1084 break;
1085 flag = 0;
1086 }
1087 else if(c==0 && flag==0)
1088 {
1089 s1 = (char*)cp;
1090 flag++;
1091 }
1092 }
1093 *cp = 0;
1094 if(s1 != string)
1095 strcpy(string,s1);
1096 return(string);
1097 }
1098
1099 #endif /* SHOPT_ESH */
1100
1101 #if SHOPT_ESH
1102 /*
1103 * given the current command and line number,
1104 * and number of lines back or foward,
1105 * compute the new command and line number.
1106 */
1107
1108 Histloc_t hist_locate(History_t *hp,register int command,register int line,int lines)
1109 {
1110 Histloc_t next;
1111 line += lines;
1112 if(!hp)
1113 {
1114 command = -1;
1115 goto done;
1116 }
1117 if(lines > 0)
1118 {
1119 register int count;
1120 while(command <= hp->histind)
1121 {
1122 count = hist_copy(NIL(char*),0, command,-1);
1123 if(count > line)
1124 goto done;
1125 line -= count;
1126 command++;
1127 }
1128 }
1129 else
1130 {
1131 register int least = (int)hp->histind-hp->histsize;
1132 while(1)
1133 {
1134 if(line >=0)
1135 goto done;
1136 if(--command < least)
1137 break;
1138 line += hist_copy(NIL(char*),0, command,-1);
1139 }
1140 command = -1;
1141 }
1142 done:
1143 next.hist_line = line;
1144 next.hist_command = command;
1145 return(next);
1146 }
1147 #endif /* SHOPT_ESH */
1148
1149
1150 /*
1151 * Handle history file exceptions
1152 */
1153 #ifdef SF_BUFCONST
1154 static int hist_exceptf(Sfio_t* fp, int type, void *data, Sfdisc_t *handle)
1155 #else
1156 static int hist_exceptf(Sfio_t* fp, int type, Sfdisc_t *handle)
1157 #endif
1158 {
1159 register int newfd,oldfd;
1160 History_t *hp = (History_t*)handle;
1161 if(type==SF_WRITE)
1162 {
1163 if(errno==ENOSPC || hp->histwfail++ >= 10)
1164 return(0);
1165 /* write failure could be NFS problem, try to re-open */
1166 close(oldfd=sffileno(fp));
1167 if((newfd=open(hp->histname,O_BINARY|O_APPEND|O_CREAT|O_RDWR,S_IRUSR|S_IWUSR)) >= 0)
1168 {
1169 if(fcntl(newfd, F_DUPFD, oldfd) !=oldfd)
1170 return(-1);
1171 fcntl(oldfd,F_SETFD,FD_CLOEXEC);
1172 close(newfd);
1173 if(lseek(oldfd,(off_t)0,SEEK_END) < hp->histcnt)
1174 {
1175 register int index = hp->histind;
1176 lseek(oldfd,(off_t)2,SEEK_SET);
1177 hp->histcnt = 2;
1178 hp->histind = 1;
1179 hp->histcmds[1] = 2;
1180 hist_eof(hp);
1181 hp->histmarker = hp->histcnt;
1182 hp->histind = index;
1183 }
1184 return(1);
1185 }
1186 errormsg(SH_DICT,2,"History file write error-%d %s: file unrecoverable",errno,hp->histname);
1187 return(-1);
1188 }
1189 return(0);
1190 }
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