-
Notifications
You must be signed in to change notification settings - Fork 0
/
variable.c
345 lines (271 loc) · 6.24 KB
/
variable.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
/*
* Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
*
* This file is part of Jam - see jam.c for Copyright information.
*/
/*
* variable.c - handle jam multi-element variables
*
* External routines:
*
* var_defines() - load a bunch of variable=value settings
* var_string() - expand a string with variables in it
* var_get() - get value of a user defined symbol
* var_set() - set a variable in jam's user defined symbol table
* var_swap() - swap a variable's value with the given one
* var_done() - free variable tables
*
* Internal routines:
*
* var_enter() - make new var symbol table entry, returning var ptr
* var_dump() - dump a variable to stdout
*
* 04/13/94 (seiwald) - added shorthand L0 for null list pointer
* 08/23/94 (seiwald) - Support for '+=' (append to variable)
* 01/22/95 (seiwald) - split environment variables at blanks or :'s
* 05/10/95 (seiwald) - split path variables at SPLITPATH (not :)
* 09/11/00 (seiwald) - defunct var_list() removed
* 10/22/02 (seiwald) - list_new() now does its own newstr()/copystr()
* 11/04/02 (seiwald) - const-ing for string literals
*/
# include "jam.h"
# include "lists.h"
# include "parse.h"
# include "variable.h"
# include "expand.h"
# include "hash.h"
# include "newstr.h"
static struct hash *varhash = 0;
/*
* VARIABLE - a user defined multi-value variable
*/
typedef struct _variable VARIABLE ;
struct _variable {
const char *symbol;
LIST *value;
} ;
static VARIABLE *var_enter( const char *symbol );
static void var_dump( const char *symbol, LIST *value, const char *what );
/*
* var_defines() - load a bunch of variable=value settings
*
* If variable name ends in PATH, split value at :'s.
* Otherwise, split at blanks.
*/
void
var_defines( const char **e )
{
for( ; *e; e++ )
{
const char *val;
/* Just say "no": windows defines this in the env, */
/* but we don't want it to override our notion of OS. */
if( !strcmp( *e, "OS=Windows_NT" ) )
continue;
# ifdef OS_MAC
/* On the mac (MPW), the var=val is actually var\0val */
/* Think different. */
if( ( val = strchr( *e, '=' ) ) || ( val = *e + strlen( *e ) ) )
# else
if( val = strchr( *e, '=' ) )
# endif
{
LIST *l = L0;
const char *pp, *p;
# ifdef OS_MAC
char split = ',';
# else
char split = ' ';
# endif
char buf[ MAXSYM ];
/* Split *PATH at :'s, not spaces */
if( val - 4 >= *e )
{
if( !strncmp( val - 4, "PATH", 4 ) ||
!strncmp( val - 4, "Path", 4 ) ||
!strncmp( val - 4, "path", 4 ) )
split = SPLITPATH;
}
/* Do the split */
for( pp = val + 1; p = strchr( pp, split ); pp = p + 1 )
{
strncpy( buf, pp, p - pp );
buf[ p - pp ] = '\0';
l = list_new( l, buf, 0 );
}
l = list_new( l, pp, 0 );
/* Get name */
strncpy( buf, *e, val - *e );
buf[ val - *e ] = '\0';
var_set( buf, l, VAR_SET );
}
}
}
/*
* var_string() - expand a string with variables in it
*
* Copies in to out; doesn't modify targets & sources.
*/
int
var_string(
const char *in,
char *out,
int outsize,
LOL *lol )
{
char *out0 = out;
char *oute = out + outsize - 1;
while( *in )
{
char *lastword;
int dollar = 0;
/* Copy white space */
while( isspace( *in ) )
{
if( out >= oute )
return -1;
*out++ = *in++;
}
lastword = out;
/* Copy non-white space, watching for variables */
while( *in && !isspace( *in ) )
{
if( out >= oute )
return -1;
if( in[0] == '$' && in[1] == '(' )
dollar++;
*out++ = *in++;
}
/* If a variable encountered, expand it and and embed the */
/* space-separated members of the list in the output. */
if( dollar )
{
LIST *l = var_expand( L0, lastword, out, lol, 0 );
out = lastword;
while( l )
{
int so = strlen( l->string );
if( out + so >= oute )
return -1;
strcpy( out, l->string );
out += so;
/* Separate with space */
if( l = list_next( l ) )
*out++ = ' ';
}
list_free( l );
}
}
if( out >= oute )
return -1;
*out++ = '\0';
return out - out0;
}
/*
* var_get() - get value of a user defined symbol
*
* Returns NULL if symbol unset.
*/
LIST *
var_get( const char *symbol )
{
VARIABLE var, *v = &var;
v->symbol = symbol;
if( varhash && hashcheck( varhash, (HASHDATA **)&v ) )
{
if( DEBUG_VARGET )
var_dump( v->symbol, v->value, "get" );
return v->value;
}
return 0;
}
/*
* var_set() - set a variable in jam's user defined symbol table
*
* 'flag' controls the relationship between new and old values of
* the variable: SET replaces the old with the new; APPEND appends
* the new to the old; DEFAULT only uses the new if the variable
* was previously unset.
*
* Copies symbol. Takes ownership of value.
*/
void
var_set(
const char *symbol,
LIST *value,
int flag )
{
VARIABLE *v = var_enter( symbol );
if( DEBUG_VARSET )
var_dump( symbol, value, "set" );
switch( flag )
{
case VAR_SET:
/* Replace value */
list_free( v->value );
v->value = value;
break;
case VAR_APPEND:
/* Append value */
v->value = list_append( v->value, value );
break;
case VAR_DEFAULT:
/* Set only if unset */
if( !v->value )
v->value = value;
else
list_free( value );
break;
}
}
/*
* var_swap() - swap a variable's value with the given one
*/
LIST *
var_swap(
const char *symbol,
LIST *value )
{
VARIABLE *v = var_enter( symbol );
LIST *oldvalue = v->value;
if( DEBUG_VARSET )
var_dump( symbol, value, "set" );
v->value = value;
return oldvalue;
}
/*
* var_enter() - make new var symbol table entry, returning var ptr
*/
static VARIABLE *
var_enter( const char *symbol )
{
VARIABLE var, *v = &var;
if( !varhash )
varhash = hashinit( sizeof( VARIABLE ), "variables" );
v->symbol = symbol;
v->value = 0;
if( hashenter( varhash, (HASHDATA **)&v ) )
v->symbol = newstr( symbol ); /* never freed */
return v;
}
/*
* var_dump() - dump a variable to stdout
*/
static void
var_dump(
const char *symbol,
LIST *value,
const char *what )
{
printf( "%s %s = ", what, symbol );
list_print( value );
printf( "\n" );
}
/*
* var_done() - free variable tables
*/
void
var_done()
{
hashdone( varhash );
}