xref: /titanic_51/usr/src/lib/libshell/common/sh/arith.c (revision 36e852a172cba914383d7341c988128b2c667fbd) 
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1982-2009 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  * Shell arithmetic - uses streval library
23  *   David Korn
24  *   AT&T Labs
25  */
26 
27 #include	"defs.h"
28 #include	"lexstates.h"
29 #include	"name.h"
30 #include	"streval.h"
31 #include	"variables.h"
32 
33 #ifndef LLONG_MAX
34 #define LLONG_MAX	LONG_MAX
35 #endif
36 
37 static Sfdouble_t	NaN, Inf, Fun;
38 static Namval_t Infnod =
39 {
40 	{ 0 },
41 	"Inf",
42 	NV_NOFREE|NV_LDOUBLE,NV_RDONLY
43 };
44 
45 static Namval_t NaNnod =
46 {
47 	{ 0 },
48 	"NaN",
49 	NV_NOFREE|NV_LDOUBLE,NV_RDONLY
50 };
51 
52 static Namval_t FunNode =
53 {
54 	{ 0 },
55 	"?",
56 	NV_NOFREE|NV_LDOUBLE,NV_RDONLY
57 };
58 
59 static Namval_t *scope(Shell_t *shp,register Namval_t *np,register struct lval *lvalue,int assign)
60 {
61 	register Namarr_t *ap;
62 	register int flag = lvalue->flag;
63 	register char *sub=0, *cp=(char*)np;
64 	register Namval_t *mp;
65 	int	flags = HASH_NOSCOPE|HASH_SCOPE|HASH_BUCKET;
66 	Dt_t	*sdict = (shp->st.real_fun? shp->st.real_fun->sdict:0);
67 	Dt_t	*root = shp->var_tree;
68 	assign = assign?NV_ASSIGN:NV_NOASSIGN;
69 	if(cp>=lvalue->expr &&  cp < lvalue->expr+lvalue->elen)
70 	{
71 		int offset;
72 		/* do binding to node now */
73 		int c = cp[flag];
74 		cp[flag] = 0;
75 		if((!(np = nv_open(cp,shp->var_tree,assign|NV_VARNAME|NV_NOADD|NV_NOFAIL)) || nv_isnull(np)) && sh_macfun(shp,cp, offset = staktell()))
76 		{
77 			Fun = sh_arith(sub=stakptr(offset));
78 			FunNode.nvalue.ldp = &Fun;
79 			cp[flag] = c;
80 			return(&FunNode);
81 		}
82 		if(!np && assign)
83 			np = nv_open(cp,shp->var_tree,assign|NV_VARNAME);
84 		if(!np)
85 			return(0);
86 		root = shp->last_root;
87 		cp[flag] = c;
88 		if(cp[flag+1]=='[')
89 			flag++;
90 		else
91 			flag = 0;
92 		cp = (char*)np;
93 	}
94 	if((lvalue->emode&ARITH_COMP) && dtvnext(root) && ((mp=nv_search(cp,root,flags))||(sdict && (mp=nv_search(cp,sdict,flags)))))
95 	{
96 		while(nv_isref(mp))
97 		{
98 			sub = nv_refsub(mp);
99 			mp = nv_refnode(mp);
100 		}
101 		np = mp;
102 	}
103 	if(flag || sub)
104 	{
105 		if(!sub)
106 			sub = (char*)&lvalue->expr[flag];
107 		nv_endsubscript(np,sub,NV_ADD|NV_SUBQUOTE);
108 	}
109 	return(np);
110 }
111 
112 static Sfdouble_t arith(const char **ptr, struct lval *lvalue, int type, Sfdouble_t n)
113 {
114 	Shell_t		*shp = &sh;
115 	register Sfdouble_t r= 0;
116 	char *str = (char*)*ptr;
117 	register char *cp;
118 	switch(type)
119 	{
120 	    case ASSIGN:
121 	    {
122 		register Namval_t *np = (Namval_t*)(lvalue->value);
123 		np = scope(shp,np,lvalue,1);
124 		nv_putval(np, (char*)&n, NV_LDOUBLE);
125 		r=nv_getnum(np);
126 		break;
127 	    }
128 	    case LOOKUP:
129 	    {
130 		register int c = *str;
131 		register char *xp=str;
132 		lvalue->value = (char*)0;
133 		if(c=='.')
134 			str++;
135 		c = mbchar(str);
136 		if(isaletter(c))
137 		{
138 			register Namval_t *np;
139 			int dot=0;
140 			while(1)
141 			{
142 				while(xp=str, c=mbchar(str), isaname(c));
143 				str = xp;
144 				if(c=='[' && dot==NV_NOADD)
145 				{
146 					str = nv_endsubscript((Namval_t*)0,str,0);
147 					c = *str;
148 				}
149 				if(c!='.')
150 					break;
151 				dot=NV_NOADD;
152 				if((c = *++str) !='[')
153 					continue;
154 				str = nv_endsubscript((Namval_t*)0,cp=str,NV_SUBQUOTE)-1;
155 				if(sh_checkid(cp+1,(char*)0))
156 					str -=2;
157 			}
158 			if(c=='(')
159 			{
160 				int fsize = str- (char*)(*ptr);
161 				const struct mathtab *tp;
162 				c = **ptr;
163 				lvalue->fun = 0;
164 				if(fsize<=(sizeof(tp->fname)-2)) for(tp=shtab_math; *tp->fname; tp++)
165 				{
166 					if(*tp->fname > c)
167 						break;
168 					if(tp->fname[1]==c && tp->fname[fsize+1]==0 && strncmp(&tp->fname[1],*ptr,fsize)==0)
169 					{
170 						lvalue->fun = tp->fnptr;
171 						lvalue->nargs = *tp->fname;
172 						break;
173 					}
174 				}
175 				if(lvalue->fun)
176 					break;
177 				lvalue->value = (char*)ERROR_dictionary(e_function);
178 				return(r);
179 			}
180 			if((lvalue->emode&ARITH_COMP) && dot)
181 			{
182 				lvalue->value = (char*)*ptr;
183 				lvalue->flag =  str-lvalue->value;
184 				break;
185 			}
186 			*str = 0;
187 			if(sh_isoption(SH_NOEXEC))
188 				np = L_ARGNOD;
189 			else
190 			{
191 				int offset = staktell();
192 				char *saveptr = stakfreeze(0);
193 				Dt_t  *root = (lvalue->emode&ARITH_COMP)?shp->var_base:shp->var_tree;
194 				*str = c;
195 				while(c=='[' || c=='.')
196 				{
197 					if(c=='[')
198 					{
199 						str = nv_endsubscript(np,cp=str,0);
200 						if((c= *str)!='[' &&  c!='.')
201 						{
202 							str = cp;
203 							c = '[';
204 							break;
205 						}
206 					}
207 					else
208 					{
209 						dot = NV_NOADD|NV_NOFAIL;
210 						str++;
211 						while(xp=str, c=mbchar(str), isaname(c));
212 						str = xp;
213 					}
214 				}
215 				*str = 0;
216 				cp = (char*)*ptr;
217 				if ((cp[0] == 'i' || cp[0] == 'I') && (cp[1] == 'n' || cp[1] == 'N') && (cp[2] == 'f' || cp[2] == 'F') && cp[3] == 0)
218 				{
219 					Inf = strtold("Inf", NiL);
220 					Infnod.nvalue.ldp = &Inf;
221 					np = &Infnod;
222 				}
223 				else if ((cp[0] == 'n' || cp[0] == 'N') && (cp[1] == 'a' || cp[1] == 'A') && (cp[2] == 'n' || cp[2] == 'N') && cp[3] == 0)
224 				{
225 					NaN = strtold("NaN", NiL);
226 					NaNnod.nvalue.ldp = &NaN;
227 					np = &NaNnod;
228 				}
229 				else if(!(np = nv_open(*ptr,root,NV_NOASSIGN|NV_VARNAME|dot)))
230 				{
231 					lvalue->value = (char*)*ptr;
232 					lvalue->flag =  str-lvalue->value;
233 				}
234 				if(saveptr != stakptr(0))
235 					stakset(saveptr,offset);
236 				else
237 					stakseek(offset);
238 			}
239 			*str = c;
240 			if(!np && lvalue->value)
241 				break;
242 			lvalue->value = (char*)np;
243 			/* bind subscript later */
244 			if(nv_isattr(np,NV_DOUBLE)==NV_DOUBLE)
245 				lvalue->isfloat=1;
246 			lvalue->flag = 0;
247 			if(c=='[')
248 			{
249 				lvalue->flag = (str-lvalue->expr);
250 				do
251 					str = nv_endsubscript(np,str,0);
252 				while((c= *str)=='[');
253 				break;
254 			}
255 		}
256 		else
257 		{
258 			char	lastbase=0, *val = xp, oerrno = errno;
259 			errno = 0;
260 			r = strtonll(val,&str, &lastbase,-1);
261 			if(*str=='8' || *str=='9')
262 			{
263 				lastbase=10;
264 				errno = 0;
265 				r = strtonll(val,&str, &lastbase,-1);
266 			}
267 			if(lastbase<=1)
268 				lastbase=10;
269 			if(*val=='0')
270 			{
271 				while(*val=='0')
272 					val++;
273 				if(*val==0 || *val=='.' || *val=='x' || *val=='X')
274 					val--;
275 			}
276 			if(r==LLONG_MAX && errno)
277 				c='e';
278 			else
279 				c = *str;
280 			if(c==GETDECIMAL(0) || c=='e' || c == 'E' || lastbase ==
281  16 && (c == 'p' || c == 'P'))
282 			{
283 				lvalue->isfloat=1;
284 				r = strtold(val,&str);
285 			}
286 			else if(lastbase==10 && val[1])
287 			{
288 				if(val[2]=='#')
289 					val += 3;
290 				if((str-val)>2*sizeof(Sflong_t))
291 				{
292 					Sfdouble_t rr;
293 					rr = strtold(val,&str);
294 					if(rr!=r)
295 					{
296 						r = rr;
297 						lvalue->isfloat=1;
298 					}
299 				}
300 			}
301 			errno = oerrno;
302 		}
303 		break;
304 	    }
305 	    case VALUE:
306 	    {
307 		register Namval_t *np = (Namval_t*)(lvalue->value);
308 		if(sh_isoption(SH_NOEXEC))
309 			return(0);
310 		np = scope(shp,np,lvalue,0);
311 		if(!np)
312 		{
313 			if(sh_isoption(SH_NOUNSET))
314 			{
315 				*ptr = lvalue->value;
316 				goto skip;
317 			}
318 			return(0);
319 		}
320 		if(((lvalue->emode&2) || lvalue->level>1 || sh_isoption(SH_NOUNSET)) && nv_isnull(np) && !nv_isattr(np,NV_INTEGER))
321 		{
322 			*ptr = nv_name(np);
323 		skip:
324 			lvalue->value = (char*)ERROR_dictionary(e_notset);
325 			lvalue->emode |= 010;
326 			return(0);
327 		}
328 		r = nv_getnum(np);
329 		if(nv_isattr(np,NV_INTEGER|NV_BINARY)==(NV_INTEGER|NV_BINARY))
330 			lvalue->isfloat= (r!=(Sflong_t)r);
331 		else if(nv_isattr(np,NV_DOUBLE)==NV_DOUBLE)
332 			lvalue->isfloat=1;
333 		return(r);
334 	    }
335 
336 	    case MESSAGE:
337 		sfsync(NIL(Sfio_t*));
338 #if 0
339 		if(warn)
340 			errormsg(SH_DICT,ERROR_warn(0),lvalue->value,*ptr);
341 		else
342 #endif
343 			errormsg(SH_DICT,ERROR_exit((lvalue->emode&3)!=0),lvalue->value,*ptr);
344 	}
345 	*ptr = str;
346 	return(r);
347 }
348 
349 /*
350  * convert number defined by string to a Sfdouble_t
351  * ptr is set to the last character processed
352  * if mode>0, an error will be fatal with value <mode>
353  */
354 
355 Sfdouble_t sh_strnum(register const char *str, char** ptr, int mode)
356 {
357 	register Sfdouble_t d;
358 	char base=0, *last;
359 	if(*str==0)
360 	{
361 		if(ptr)
362 			*ptr = (char*)str;
363 		return(0);
364 	}
365 	errno = 0;
366 	d = strtonll(str,&last,&base,-1);
367 	if(*last || errno)
368 	{
369 		if(!last || *last!='.' || last[1]!='.')
370 			d = strval(str,&last,arith,mode);
371 		if(!ptr && *last && mode>0)
372 			errormsg(SH_DICT,ERROR_exit(1),e_lexbadchar,*last,str);
373 	}
374 	else if (!d && *str=='-')
375 		d = -0.0;
376 	if(ptr)
377 		*ptr = last;
378 	return(d);
379 }
380 
381 Sfdouble_t sh_arith(register const char *str)
382 {
383 	return(sh_strnum(str, (char**)0, 1));
384 }
385 
386 void	*sh_arithcomp(register char *str)
387 {
388 	const char *ptr = str;
389 	Arith_t *ep;
390 	ep = arith_compile(str,(char**)&ptr,arith,ARITH_COMP|1);
391 	if(*ptr)
392 		errormsg(SH_DICT,ERROR_exit(1),e_lexbadchar,*ptr,str);
393 	return((void*)ep);
394 }
395