Root/scripts/config/symbol.c

1/*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
6#include <ctype.h>
7#include <stdlib.h>
8#include <string.h>
9#include <regex.h>
10#include <sys/utsname.h>
11
12#define LKC_DIRECT_LINK
13#include "lkc.h"
14
15struct symbol symbol_yes = {
16    .name = "y",
17    .curr = { "y", yes },
18    .flags = SYMBOL_YES|SYMBOL_VALID,
19}, symbol_mod = {
20    .name = "m",
21    .curr = { "m", mod },
22    .flags = SYMBOL_MOD|SYMBOL_VALID,
23}, symbol_no = {
24    .name = "n",
25    .curr = { "n", no },
26    .flags = SYMBOL_NO|SYMBOL_VALID,
27}, symbol_empty = {
28    .name = "",
29    .curr = { "", no },
30    .flags = SYMBOL_VALID,
31};
32
33int sym_change_count;
34struct symbol *modules_sym;
35tristate modules_val;
36
37void sym_add_default(struct symbol *sym, const char *def)
38{
39    struct property *prop = prop_alloc(P_DEFAULT, sym);
40
41    prop->expr = expr_alloc_symbol(sym_lookup(def, 1));
42}
43
44void sym_init(void)
45{
46    struct symbol *sym;
47    struct utsname uts;
48    char *p;
49    static bool inited = false;
50
51    if (inited)
52        return;
53    inited = true;
54
55    uname(&uts);
56
57    sym = sym_lookup("ARCH", 0);
58    sym->type = S_STRING;
59    p = getenv("ARCH");
60    if (p)
61        sym_add_default(sym, p);
62
63    sym = sym_lookup("OPENWRTVERSION", 0);
64    sym->type = S_STRING;
65    sym->flags |= SYMBOL_AUTO;
66    p = getenv("OPENWRTVERSION");
67    if (p)
68        sym_add_default(sym, p);
69
70    sym = sym_lookup("UNAME_RELEASE", 0);
71    sym->type = S_STRING;
72    sym->flags |= SYMBOL_AUTO;
73    sym_add_default(sym, uts.release);
74}
75
76enum symbol_type sym_get_type(struct symbol *sym)
77{
78    enum symbol_type type = sym->type;
79
80    if (type == S_TRISTATE) {
81        if (sym_is_choice_value(sym) && sym->visible == yes)
82            type = S_BOOLEAN;
83/* tristate always enabled */
84#if 0
85        else if (modules_val == no)
86            type = S_BOOLEAN;
87#endif
88    }
89    return type;
90}
91
92const char *sym_type_name(enum symbol_type type)
93{
94    switch (type) {
95    case S_BOOLEAN:
96        return "boolean";
97    case S_TRISTATE:
98        return "tristate";
99    case S_INT:
100        return "integer";
101    case S_HEX:
102        return "hex";
103    case S_STRING:
104        return "string";
105    case S_UNKNOWN:
106        return "unknown";
107    case S_OTHER:
108        break;
109    }
110    return "???";
111}
112
113struct property *sym_get_choice_prop(struct symbol *sym)
114{
115    struct property *prop;
116
117    for_all_choices(sym, prop)
118        return prop;
119    return NULL;
120}
121
122struct property *sym_get_default_prop(struct symbol *sym)
123{
124    struct property *prop;
125
126    for_all_defaults(sym, prop) {
127        prop->visible.tri = expr_calc_value(prop->visible.expr);
128        if (prop->visible.tri != no)
129            return prop;
130    }
131    return NULL;
132}
133
134struct property *sym_get_range_prop(struct symbol *sym)
135{
136    struct property *prop;
137
138    for_all_properties(sym, prop, P_RANGE) {
139        prop->visible.tri = expr_calc_value(prop->visible.expr);
140        if (prop->visible.tri != no)
141            return prop;
142    }
143    return NULL;
144}
145
146static int sym_get_range_val(struct symbol *sym, int base)
147{
148    sym_calc_value(sym);
149    switch (sym->type) {
150    case S_INT:
151        base = 10;
152        break;
153    case S_HEX:
154        base = 16;
155        break;
156    default:
157        break;
158    }
159    return strtol(sym->curr.val, NULL, base);
160}
161
162static void sym_validate_range(struct symbol *sym)
163{
164    struct property *prop;
165    int base, val, val2;
166    char str[64];
167
168    switch (sym->type) {
169    case S_INT:
170        base = 10;
171        break;
172    case S_HEX:
173        base = 16;
174        break;
175    default:
176        return;
177    }
178    prop = sym_get_range_prop(sym);
179    if (!prop)
180        return;
181    val = strtol(sym->curr.val, NULL, base);
182    val2 = sym_get_range_val(prop->expr->left.sym, base);
183    if (val >= val2) {
184        val2 = sym_get_range_val(prop->expr->right.sym, base);
185        if (val <= val2)
186            return;
187    }
188    if (sym->type == S_INT)
189        sprintf(str, "%d", val2);
190    else
191        sprintf(str, "0x%x", val2);
192    sym->curr.val = strdup(str);
193}
194
195static void sym_calc_visibility(struct symbol *sym)
196{
197    struct property *prop;
198    tristate tri;
199    int deselected = 0;
200
201    /* any prompt visible? */
202    tri = no;
203    for_all_prompts(sym, prop) {
204        prop->visible.tri = expr_calc_value(prop->visible.expr);
205        tri = E_OR(tri, prop->visible.tri);
206    }
207    if (tri == mod && (sym->type != S_TRISTATE))
208        tri = yes;
209    if (sym->rev_dep_inv.expr && (expr_calc_value(sym->rev_dep_inv.expr) == yes)) {
210        tri = no;
211        deselected = 1;
212    }
213    if (sym->visible != tri) {
214        sym->visible = tri;
215        sym_set_changed(sym);
216    }
217    if (sym_is_choice_value(sym) || deselected)
218        return;
219    tri = no;
220    if (sym->rev_dep.expr)
221        tri = expr_calc_value(sym->rev_dep.expr);
222    if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
223        tri = yes;
224    if (sym->rev_dep.tri != tri) {
225        sym->rev_dep.tri = tri;
226        sym_set_changed(sym);
227    }
228}
229
230static struct symbol *sym_calc_choice(struct symbol *sym)
231{
232    struct symbol *def_sym;
233    struct property *prop;
234    struct expr *e;
235
236    /* is the user choice visible? */
237    def_sym = sym->user.val;
238    if (def_sym) {
239        sym_calc_visibility(def_sym);
240        if (def_sym->visible != no)
241            return def_sym;
242    }
243
244    /* any of the defaults visible? */
245    for_all_defaults(sym, prop) {
246        prop->visible.tri = expr_calc_value(prop->visible.expr);
247        if (prop->visible.tri == no)
248            continue;
249        def_sym = prop_get_symbol(prop);
250        sym_calc_visibility(def_sym);
251        if (def_sym->visible != no)
252            return def_sym;
253    }
254
255    /* just get the first visible value */
256    prop = sym_get_choice_prop(sym);
257    for (e = prop->expr; e; e = e->left.expr) {
258        def_sym = e->right.sym;
259        sym_calc_visibility(def_sym);
260        if (def_sym->visible != no)
261            return def_sym;
262    }
263
264    /* no choice? reset tristate value */
265    sym->curr.tri = no;
266    return NULL;
267}
268
269void sym_set_changed(struct symbol *sym)
270{
271    struct property *prop;
272
273    sym->flags |= SYMBOL_CHANGED;
274    for (prop = sym->prop; prop; prop = prop->next) {
275        if (prop->menu)
276            prop->menu->flags |= MENU_CHANGED;
277    }
278}
279
280void sym_set_all_changed(void)
281{
282    struct symbol *sym;
283    int i;
284
285    for_all_symbols(i, sym)
286        sym_set_changed(sym);
287}
288
289void sym_calc_value(struct symbol *sym)
290{
291    struct symbol_value newval, oldval;
292    struct property *prop;
293    struct expr *e;
294
295    if (!sym)
296        return;
297
298    if (sym->flags & SYMBOL_VALID)
299        return;
300    sym->flags |= SYMBOL_VALID;
301
302    oldval = sym->curr;
303
304    switch (sym->type) {
305    case S_INT:
306    case S_HEX:
307    case S_STRING:
308        newval = symbol_empty.curr;
309        break;
310    case S_BOOLEAN:
311    case S_TRISTATE:
312        newval = symbol_no.curr;
313        break;
314    default:
315        sym->curr.val = sym->name;
316        sym->curr.tri = no;
317        return;
318    }
319    if (!sym_is_choice_value(sym))
320        sym->flags &= ~SYMBOL_WRITE;
321
322    sym_calc_visibility(sym);
323
324    /* set default if recursively called */
325    sym->curr = newval;
326
327    switch (sym_get_type(sym)) {
328    case S_BOOLEAN:
329    case S_TRISTATE:
330        if (sym_is_choice_value(sym) && sym->visible == yes) {
331            prop = sym_get_choice_prop(sym);
332            newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
333        } else if (sym->rev_dep_inv.expr && (expr_calc_value(sym->rev_dep_inv.expr) == yes)) {
334            newval.tri = no;
335        } else if (E_OR(sym->visible, sym->rev_dep.tri) != no) {
336            sym->flags |= SYMBOL_WRITE;
337            if (sym_has_value(sym))
338                newval.tri = sym->user.tri;
339            else if (!sym_is_choice(sym)) {
340                prop = sym_get_default_prop(sym);
341                if (prop)
342                    newval.tri = expr_calc_value(prop->expr);
343            }
344            newval.tri = E_OR(E_AND(newval.tri, sym->visible), sym->rev_dep.tri);
345        } else if (!sym_is_choice(sym)) {
346            prop = sym_get_default_prop(sym);
347            if (prop) {
348                sym->flags |= SYMBOL_WRITE;
349                newval.tri = expr_calc_value(prop->expr);
350            }
351        }
352        if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
353            newval.tri = yes;
354        break;
355    case S_STRING:
356    case S_HEX:
357    case S_INT:
358        if (sym->visible != no) {
359            sym->flags |= SYMBOL_WRITE;
360            if (sym_has_value(sym)) {
361                newval.val = sym->user.val;
362                break;
363            }
364        }
365        prop = sym_get_default_prop(sym);
366        if (prop) {
367            struct symbol *ds = prop_get_symbol(prop);
368            if (ds) {
369                sym->flags |= SYMBOL_WRITE;
370                sym_calc_value(ds);
371                newval.val = ds->curr.val;
372            }
373        }
374        break;
375    default:
376        ;
377    }
378
379    sym->curr = newval;
380    if (sym_is_choice(sym) && newval.tri == yes)
381        sym->curr.val = sym_calc_choice(sym);
382    sym_validate_range(sym);
383
384    if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
385        sym->flags &= ~SYMBOL_VALID;
386        sym_set_changed(sym);
387        if (modules_sym == sym) {
388            sym_set_all_changed();
389            modules_val = modules_sym->curr.tri;
390        }
391    }
392
393    if (sym_is_choice(sym)) {
394        int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
395        prop = sym_get_choice_prop(sym);
396        for (e = prop->expr; e; e = e->left.expr) {
397            e->right.sym->flags |= flags;
398            if (flags & SYMBOL_CHANGED)
399                sym_set_changed(e->right.sym);
400        }
401    }
402
403    if (sym->flags & SYMBOL_AUTO)
404        sym->flags &= ~SYMBOL_WRITE;
405}
406
407void sym_clear_all_valid(void)
408{
409    struct symbol *sym;
410    int i;
411
412    for_all_symbols(i, sym)
413        sym->flags &= ~SYMBOL_VALID;
414    sym_change_count++;
415    if (modules_sym)
416        sym_calc_value(modules_sym);
417}
418
419bool sym_tristate_within_range(struct symbol *sym, tristate val)
420{
421    int type = sym_get_type(sym);
422
423    if (sym->visible == no)
424        return false;
425
426    if (type != S_BOOLEAN && type != S_TRISTATE)
427        return false;
428
429    if (type == S_BOOLEAN && val == mod)
430        return false;
431    if (sym->visible <= sym->rev_dep.tri)
432        return false;
433    if (sym_is_choice_value(sym) && sym->visible == yes)
434        return val == yes;
435    return val >= sym->rev_dep.tri && val <= sym->visible;
436}
437
438bool sym_set_tristate_value(struct symbol *sym, tristate val)
439{
440    tristate oldval = sym_get_tristate_value(sym);
441
442    if (oldval != val && !sym_tristate_within_range(sym, val))
443        return false;
444
445    if (sym->flags & SYMBOL_NEW) {
446        sym->flags &= ~SYMBOL_NEW;
447        sym_set_changed(sym);
448    }
449    /*
450     * setting a choice value also resets the new flag of the choice
451     * symbol and all other choice values.
452     */
453    if (sym_is_choice_value(sym) && val == yes) {
454        struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
455        struct property *prop;
456        struct expr *e;
457
458        cs->user.val = sym;
459        cs->flags &= ~SYMBOL_NEW;
460        prop = sym_get_choice_prop(cs);
461        for (e = prop->expr; e; e = e->left.expr) {
462            if (e->right.sym->visible != no)
463                e->right.sym->flags &= ~SYMBOL_NEW;
464        }
465    }
466
467    sym->user.tri = val;
468    if (oldval != val) {
469        sym_clear_all_valid();
470    }
471
472    return true;
473}
474
475tristate sym_toggle_tristate_value(struct symbol *sym)
476{
477    tristate oldval, newval;
478
479    oldval = newval = sym_get_tristate_value(sym);
480    do {
481        switch (newval) {
482        case no:
483            newval = mod;
484            break;
485        case mod:
486            newval = yes;
487            break;
488        case yes:
489            newval = no;
490            break;
491        }
492        if (sym_set_tristate_value(sym, newval))
493            break;
494    } while (oldval != newval);
495    return newval;
496}
497
498bool sym_string_valid(struct symbol *sym, const char *str)
499{
500    signed char ch;
501
502    switch (sym->type) {
503    case S_STRING:
504        return true;
505    case S_INT:
506        ch = *str++;
507        if (ch == '-')
508            ch = *str++;
509        if (!isdigit(ch))
510            return false;
511        if (ch == '0' && *str != 0)
512            return false;
513        while ((ch = *str++)) {
514            if (!isdigit(ch))
515                return false;
516        }
517        return true;
518    case S_HEX:
519        if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
520            str += 2;
521        ch = *str++;
522        do {
523            if (!isxdigit(ch))
524                return false;
525        } while ((ch = *str++));
526        return true;
527    case S_BOOLEAN:
528    case S_TRISTATE:
529        switch (str[0]) {
530        case 'y': case 'Y':
531        case 'm': case 'M':
532        case 'n': case 'N':
533            return true;
534        }
535        return false;
536    default:
537        return false;
538    }
539}
540
541bool sym_string_within_range(struct symbol *sym, const char *str)
542{
543    struct property *prop;
544    int val;
545
546    switch (sym->type) {
547    case S_STRING:
548        return sym_string_valid(sym, str);
549    case S_INT:
550        if (!sym_string_valid(sym, str))
551            return false;
552        prop = sym_get_range_prop(sym);
553        if (!prop)
554            return true;
555        val = strtol(str, NULL, 10);
556        return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
557               val <= sym_get_range_val(prop->expr->right.sym, 10);
558    case S_HEX:
559        if (!sym_string_valid(sym, str))
560            return false;
561        prop = sym_get_range_prop(sym);
562        if (!prop)
563            return true;
564        val = strtol(str, NULL, 16);
565        return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
566               val <= sym_get_range_val(prop->expr->right.sym, 16);
567    case S_BOOLEAN:
568    case S_TRISTATE:
569        switch (str[0]) {
570        case 'y': case 'Y':
571            return sym_tristate_within_range(sym, yes);
572        case 'm': case 'M':
573            return sym_tristate_within_range(sym, mod);
574        case 'n': case 'N':
575            return sym_tristate_within_range(sym, no);
576        }
577        return false;
578    default:
579        return false;
580    }
581}
582
583bool sym_set_string_value(struct symbol *sym, const char *newval)
584{
585    const char *oldval;
586    char *val;
587    int size;
588
589    switch (sym->type) {
590    case S_BOOLEAN:
591    case S_TRISTATE:
592        switch (newval[0]) {
593        case 'y': case 'Y':
594            return sym_set_tristate_value(sym, yes);
595        case 'm': case 'M':
596            return sym_set_tristate_value(sym, mod);
597        case 'n': case 'N':
598            return sym_set_tristate_value(sym, no);
599        }
600        return false;
601    default:
602        ;
603    }
604
605    if (!sym_string_within_range(sym, newval))
606        return false;
607
608    if (sym->flags & SYMBOL_NEW) {
609        sym->flags &= ~SYMBOL_NEW;
610        sym_set_changed(sym);
611    }
612
613    oldval = sym->user.val;
614    size = strlen(newval) + 1;
615    if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
616        size += 2;
617        sym->user.val = val = malloc(size);
618        *val++ = '0';
619        *val++ = 'x';
620    } else if (!oldval || strcmp(oldval, newval))
621        sym->user.val = val = malloc(size);
622    else
623        return true;
624
625    strcpy(val, newval);
626    free((void *)oldval);
627    sym_clear_all_valid();
628
629    return true;
630}
631
632const char *sym_get_string_value(struct symbol *sym)
633{
634    tristate val;
635
636    switch (sym->type) {
637    case S_BOOLEAN:
638    case S_TRISTATE:
639        val = sym_get_tristate_value(sym);
640        switch (val) {
641        case no:
642            return "n";
643        case mod:
644            return "m";
645        case yes:
646            return "y";
647        }
648        break;
649    default:
650        ;
651    }
652    return (const char *)sym->curr.val;
653}
654
655bool sym_is_changable(struct symbol *sym)
656{
657    return sym->visible > sym->rev_dep.tri;
658}
659
660struct symbol *sym_lookup(const char *name, int isconst)
661{
662    struct symbol *symbol;
663    const char *ptr;
664    char *new_name;
665    int hash = 0;
666
667    if (name) {
668        if (name[0] && !name[1]) {
669            switch (name[0]) {
670            case 'y': return &symbol_yes;
671            case 'm': return &symbol_mod;
672            case 'n': return &symbol_no;
673            }
674        }
675        for (ptr = name; *ptr; ptr++)
676            hash += *ptr;
677        hash &= 0xff;
678
679        for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
680            if (!strcmp(symbol->name, name)) {
681                if ((isconst && symbol->flags & SYMBOL_CONST) ||
682                    (!isconst && !(symbol->flags & SYMBOL_CONST)))
683                    return symbol;
684            }
685        }
686        new_name = strdup(name);
687    } else {
688        new_name = NULL;
689        hash = 256;
690    }
691
692    symbol = malloc(sizeof(*symbol));
693    memset(symbol, 0, sizeof(*symbol));
694    symbol->name = new_name;
695    symbol->type = S_UNKNOWN;
696    symbol->flags = SYMBOL_NEW;
697    if (isconst)
698        symbol->flags |= SYMBOL_CONST;
699
700    symbol->next = symbol_hash[hash];
701    symbol_hash[hash] = symbol;
702
703    return symbol;
704}
705
706struct symbol *sym_find(const char *name)
707{
708    struct symbol *symbol = NULL;
709    const char *ptr;
710    int hash = 0;
711
712    if (!name)
713        return NULL;
714
715    if (name[0] && !name[1]) {
716        switch (name[0]) {
717        case 'y': return &symbol_yes;
718        case 'm': return &symbol_mod;
719        case 'n': return &symbol_no;
720        }
721    }
722    for (ptr = name; *ptr; ptr++)
723        hash += *ptr;
724    hash &= 0xff;
725
726    for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
727        if (!strcmp(symbol->name, name) &&
728            !(symbol->flags & SYMBOL_CONST))
729                break;
730    }
731
732    return symbol;
733}
734
735struct symbol **sym_re_search(const char *pattern)
736{
737    struct symbol *sym, **sym_arr = NULL;
738    int i, cnt, size;
739    regex_t re;
740
741    cnt = size = 0;
742    /* Skip if empty */
743    if (strlen(pattern) == 0)
744        return NULL;
745    if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
746        return NULL;
747
748    for_all_symbols(i, sym) {
749        if (sym->flags & SYMBOL_CONST || !sym->name)
750            continue;
751        if (regexec(&re, sym->name, 0, NULL, 0))
752            continue;
753        if (cnt + 1 >= size) {
754            void *tmp = sym_arr;
755            size += 16;
756            sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
757            if (!sym_arr) {
758                free(tmp);
759                return NULL;
760            }
761        }
762        sym_calc_value(sym);
763        sym_arr[cnt++] = sym;
764    }
765    if (sym_arr)
766        sym_arr[cnt] = NULL;
767    regfree(&re);
768
769    return sym_arr;
770}
771
772
773struct symbol *sym_check_deps(struct symbol *sym);
774
775static struct symbol *sym_check_expr_deps(struct expr *e)
776{
777    struct symbol *sym;
778
779    if (!e)
780        return NULL;
781    switch (e->type) {
782    case E_OR:
783    case E_AND:
784        sym = sym_check_expr_deps(e->left.expr);
785        if (sym)
786            return sym;
787        return sym_check_expr_deps(e->right.expr);
788    case E_NOT:
789        return sym_check_expr_deps(e->left.expr);
790    case E_EQUAL:
791    case E_UNEQUAL:
792        sym = sym_check_deps(e->left.sym);
793        if (sym)
794            return sym;
795        return sym_check_deps(e->right.sym);
796    case E_SYMBOL:
797        return sym_check_deps(e->left.sym);
798    default:
799        break;
800    }
801    printf("Oops! How to check %d?\n", e->type);
802    return NULL;
803}
804
805struct symbol *sym_check_deps(struct symbol *sym)
806{
807    struct symbol *sym2;
808    struct property *prop;
809
810    if (sym->flags & SYMBOL_CHECK) {
811        printf("Warning! Found recursive dependency: %s", sym->name);
812        return sym;
813    }
814    if (sym->flags & SYMBOL_CHECKED)
815        return NULL;
816
817    sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
818    sym2 = sym_check_expr_deps(sym->rev_dep.expr);
819    if (sym2)
820        goto out;
821
822    for (prop = sym->prop; prop; prop = prop->next) {
823        if (prop->type == P_CHOICE || prop->type == P_SELECT || prop->type == P_DESELECT)
824            continue;
825        sym2 = sym_check_expr_deps(prop->visible.expr);
826        if (sym2)
827            goto out;
828        if (prop->type != P_DEFAULT || sym_is_choice(sym))
829            continue;
830        sym2 = sym_check_expr_deps(prop->expr);
831        if (sym2)
832            goto out;
833    }
834out:
835    if (sym2) {
836        printf(" %s", sym->name);
837        if (sym2 == sym) {
838            printf("\n");
839            sym2 = NULL;
840        }
841    }
842    sym->flags &= ~SYMBOL_CHECK;
843    return sym2;
844}
845
846struct property *prop_alloc(enum prop_type type, struct symbol *sym)
847{
848    struct property *prop;
849    struct property **propp;
850
851    prop = malloc(sizeof(*prop));
852    memset(prop, 0, sizeof(*prop));
853    prop->type = type;
854    prop->sym = sym;
855    prop->file = current_file;
856    prop->lineno = zconf_lineno();
857
858    /* append property to the prop list of symbol */
859    if (sym) {
860        for (propp = &sym->prop; *propp; propp = &(*propp)->next)
861            ;
862        *propp = prop;
863    }
864
865    return prop;
866}
867
868struct symbol *prop_get_symbol(struct property *prop)
869{
870    if (prop->expr && (prop->expr->type == E_SYMBOL ||
871               prop->expr->type == E_CHOICE))
872        return prop->expr->left.sym;
873    return NULL;
874}
875
876const char *prop_get_type_name(enum prop_type type)
877{
878    switch (type) {
879    case P_PROMPT:
880        return "prompt";
881    case P_COMMENT:
882        return "comment";
883    case P_MENU:
884        return "menu";
885    case P_DEFAULT:
886        return "default";
887    case P_CHOICE:
888        return "choice";
889    case P_SELECT:
890        return "select";
891    case P_DESELECT:
892        return "deselect";
893    case P_RANGE:
894        return "range";
895    case P_UNKNOWN:
896        break;
897    }
898    return "unknown";
899}
900

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