1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1982-2012 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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 #include "defs.h"
22 #include <stak.h>
23 #include <ls.h>
24 #include <error.h>
25 #include "variables.h"
26 #include "io.h"
27 #include "name.h"
28 #include "history.h"
29 #include "builtins.h"
30 #if SHOPT_HISTEXPAND
31 # include "edit.h"
32 #endif
33
34 #define HIST_RECURSE 5
35
36 static void hist_subst(const char*, int fd, char*);
37
38 #if 0
39 /* for the benefit of the dictionary generator */
40 int b_fc(int argc,char *argv[], Shbltin_t *context){}
41 #endif
b_hist(int argc,char * argv[],Shbltin_t * context)42 int b_hist(int argc,char *argv[], Shbltin_t *context)
43 {
44 register History_t *hp;
45 register char *arg;
46 register int flag,fdo;
47 register Shell_t *shp = context->shp;
48 Sfio_t *outfile;
49 char *fname;
50 int range[2], incr, index2, indx= -1;
51 char *edit = 0; /* name of editor */
52 char *replace = 0; /* replace old=new */
53 int lflag = 0, nflag = 0, rflag = 0;
54 #if SHOPT_HISTEXPAND
55 int pflag = 0;
56 #endif
57 Histloc_t location;
58 NOT_USED(argc);
59 if(!sh_histinit((void*)shp))
60 errormsg(SH_DICT,ERROR_system(1),e_histopen);
61 hp = shp->gd->hist_ptr;
62 while((flag = optget(argv,sh_opthist))) switch(flag)
63 {
64 case 'e':
65 edit = opt_info.arg;
66 break;
67 case 'n':
68 nflag++;
69 break;
70 case 'l':
71 lflag++;
72 break;
73 case 'r':
74 rflag++;
75 break;
76 case 's':
77 edit = "-";
78 break;
79 #if SHOPT_HISTEXPAND
80 case 'p':
81 pflag++;
82 break;
83 #endif
84 case 'N':
85 if(indx<=0)
86 {
87 if((flag = hist_max(hp) - opt_info.num-1) < 0)
88 flag = 1;
89 range[++indx] = flag;
90 break;
91 }
92 case ':':
93 errormsg(SH_DICT,2, "%s", opt_info.arg);
94 break;
95 case '?':
96 errormsg(SH_DICT,ERROR_usage(2), "%s", opt_info.arg);
97 break;
98 }
99 if(error_info.errors)
100 errormsg(SH_DICT,ERROR_usage(2),"%s",optusage((char*)0));
101 argv += (opt_info.index-1);
102 #if SHOPT_HISTEXPAND
103 if(pflag)
104 {
105 hist_cancel(hp);
106 pflag = 0;
107 while(arg=argv[1])
108 {
109 flag = hist_expand(arg,&replace);
110 if(!(flag & HIST_ERROR))
111 sfputr(sfstdout, replace, '\n');
112 else
113 pflag = 1;
114 if(replace)
115 free(replace);
116 argv++;
117 }
118 return pflag;
119 }
120 #endif
121 flag = indx;
122 while(flag<1 && (arg=argv[1]))
123 {
124 /* look for old=new argument */
125 if(!replace && strchr(arg+1,'='))
126 {
127 replace = arg;
128 argv++;
129 continue;
130 }
131 else if(isdigit(*arg) || *arg == '-')
132 {
133 /* see if completely numeric */
134 do arg++;
135 while(isdigit(*arg));
136 if(*arg==0)
137 {
138 arg = argv[1];
139 range[++flag] = (int)strtol(arg, (char**)0, 10);
140 if(*arg == '-')
141 range[flag] += (hist_max(hp)-1);
142 argv++;
143 continue;
144 }
145 }
146 /* search for last line starting with string */
147 location = hist_find(hp,argv[1],hist_max(hp)-1,0,-1);
148 if((range[++flag] = location.hist_command) < 0)
149 errormsg(SH_DICT,ERROR_exit(1),e_found,argv[1]);
150 argv++;
151 }
152 if(flag <0)
153 {
154 /* set default starting range */
155 if(lflag)
156 {
157 flag = hist_max(hp)-16;
158 if(flag<1)
159 flag = 1;
160 }
161 else
162 flag = hist_max(hp)-2;
163 range[0] = flag;
164 flag = 0;
165 }
166 index2 = hist_min(hp);
167 if(range[0]<index2)
168 range[0] = index2;
169 if(flag==0)
170 /* set default termination range */
171 range[1] = ((lflag && !edit)?hist_max(hp)-1:range[0]);
172 if(range[1]>=(flag=(hist_max(hp) - !lflag)))
173 range[1] = flag;
174 /* check for valid ranges */
175 if(range[1]<index2 || range[0]>=flag)
176 errormsg(SH_DICT,ERROR_exit(1),e_badrange,range[0],range[1]);
177 if(edit && *edit=='-' && range[0]!=range[1])
178 errormsg(SH_DICT,ERROR_exit(1),e_eneedsarg);
179 /* now list commands from range[rflag] to range[1-rflag] */
180 incr = 1;
181 flag = rflag>0;
182 if(range[1-flag] < range[flag])
183 incr = -1;
184 if(lflag)
185 {
186 outfile = sfstdout;
187 arg = "\n\t";
188 }
189 else
190 {
191 if(!(fname=pathtmp(NIL(char*),0,0,NIL(int*))))
192 errormsg(SH_DICT,ERROR_exit(1),e_create,"");
193 if((fdo=open(fname,O_CREAT|O_RDWR,S_IRUSR|S_IWUSR)) < 0)
194 errormsg(SH_DICT,ERROR_system(1),e_create,fname);
195 outfile= sfnew(NIL(Sfio_t*),shp->outbuff,IOBSIZE,fdo,SF_WRITE);
196 arg = "\n";
197 nflag++;
198 }
199 while(1)
200 {
201 if(nflag==0)
202 sfprintf(outfile,"%d\t",range[flag]);
203 else if(lflag)
204 sfputc(outfile,'\t');
205 hist_list(shp->gd->hist_ptr,outfile,hist_tell(shp->gd->hist_ptr,range[flag]),0,arg);
206 if(lflag)
207 sh_sigcheck(shp);
208 if(range[flag] == range[1-flag])
209 break;
210 range[flag] += incr;
211 }
212 if(lflag)
213 return(0);
214 sfclose(outfile);
215 hist_eof(hp);
216 arg = edit;
217 if(!arg && !(arg=nv_getval(sh_scoped(shp,HISTEDIT))) && !(arg=nv_getval(sh_scoped(shp,FCEDNOD))))
218 {
219 arg = (char*)e_defedit;
220 if(*arg!='/')
221 errormsg(SH_DICT,ERROR_exit(1),"ed not found set FCEDIT");
222 }
223 #ifdef apollo
224 /*
225 * Code to support the FC using the pad editor.
226 * Exampled of how to use: HISTEDIT=pad
227 */
228 if (strcmp (arg, "pad") == 0)
229 {
230 extern int pad_create(char*);
231 sh_close(fdo);
232 fdo = pad_create(fname);
233 pad_wait(fdo);
234 unlink(fname);
235 strcat(fname, ".bak");
236 unlink(fname);
237 lseek(fdo,(off_t)0,SEEK_SET);
238 }
239 else
240 {
241 #endif /* apollo */
242 if(*arg != '-')
243 {
244 char *com[3];
245 com[0] = arg;
246 com[1] = fname;
247 com[2] = 0;
248 error_info.errors = sh_eval(sh_sfeval(com),0);
249 }
250 fdo = sh_chkopen(fname);
251 unlink(fname);
252 free((void*)fname);
253 #ifdef apollo
254 }
255 #endif /* apollo */
256 /* don't history fc itself unless forked */
257 error_info.flags |= ERROR_SILENT;
258 if(!sh_isstate(SH_FORKED))
259 hist_cancel(hp);
260 sh_onstate(SH_HISTORY);
261 sh_onstate(SH_VERBOSE); /* echo lines as read */
262 if(replace)
263 hist_subst(error_info.id,fdo,replace);
264 else if(error_info.errors == 0)
265 {
266 char buff[IOBSIZE+1];
267 Sfio_t *iop = sfnew(NIL(Sfio_t*),buff,IOBSIZE,fdo,SF_READ);
268 /* read in and run the command */
269 if(shp->hist_depth++ > HIST_RECURSE)
270 errormsg(SH_DICT,ERROR_exit(1),e_toodeep,"history");
271 sh_eval(iop,1);
272 shp->hist_depth--;
273 }
274 else
275 {
276 sh_close(fdo);
277 if(!sh_isoption(SH_VERBOSE))
278 sh_offstate(SH_VERBOSE);
279 sh_offstate(SH_HISTORY);
280 }
281 return(shp->exitval);
282 }
283
284
285 /*
286 * given a file containing a command and a string of the form old=new,
287 * execute the command with the string old replaced by new
288 */
289
hist_subst(const char * command,int fd,char * replace)290 static void hist_subst(const char *command,int fd,char *replace)
291 {
292 register char *newp=replace;
293 register char *sp;
294 register int c;
295 off_t size;
296 char *string;
297 while(*++newp != '='); /* skip to '=' */
298 if((size = lseek(fd,(off_t)0,SEEK_END)) < 0)
299 return;
300 lseek(fd,(off_t)0,SEEK_SET);
301 c = (int)size;
302 string = stakalloc(c+1);
303 if(read(fd,string,c)!=c)
304 return;
305 string[c] = 0;
306 *newp++ = 0;
307 if((sp=sh_substitute(string,replace,newp))==0)
308 errormsg(SH_DICT,ERROR_exit(1),e_subst,command);
309 *(newp-1) = '=';
310 sh_eval(sfopen(NIL(Sfio_t*),sp,"s"),1);
311 }
312
313