~mdw / sod / blame
| Commit | Line | Data |
|---|---|---|
| 9e91c8e7 MW |
1 | /* -*-c-*- |
| 2 | * | |
| 3 | * Keyword argument handling | |
| 4 | * | |
| 5 | * (c) 2015 Straylight/Edgeware | |
| 6 | */ | |
| 7 | ||
| 8 | /*----- Licensing notice --------------------------------------------------* | |
| 9 | * | |
| 10 | * This file is part of the Sensible Object Design, an object system for C. | |
| 11 | * | |
| 12 | * SOD is free software; you can redistribute it and/or modify | |
| 13 | * it under the terms of the GNU Library General Public License as | |
| 14 | * published by the Free Software Foundation; either version 2 of the | |
| 15 | * License, or (at your option) any later version. | |
| 16 | * | |
| 17 | * SOD is distributed in the hope that it will be useful, | |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 20 | * GNU Library General Public License for more details. | |
| 21 | * | |
| 22 | * You should have received a copy of the GNU Library General Public | |
| 23 | * License along with SOD; if not, write to the Free | |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
| 25 | * MA 02111-1307, USA. | |
| 26 | */ | |
| 27 | ||
| 28 | /*----- Header files ------------------------------------------------------*/ | |
| 29 | ||
| 30 | #include "keyword.h" | |
| 31 | ||
| 32 | /*----- Global variables --------------------------------------------------*/ | |
| 33 | ||
| 34 | kw_unkhookfn *kw_unkhook = kw_defunknown; | |
| 35 | ||
| 36 | /*----- Main code ---------------------------------------------------------*/ | |
| 37 | ||
| 38 | /* --- @kw_unknown@ --- * | |
| 39 | * | |
| 40 | * Arguments: @const char *set@ = the keyword set name, as a string | |
| 41 | * @const char *kw@ = the unknown keyword argument, as a string | |
| 42 | * | |
| 43 | * Returns: Doesn't. | |
| 44 | * | |
| 45 | * Use: Called when an unrecognized keyword argument is encountered | |
| 46 | * during parsing. This calls the @kw_unkhook@ with the same | |
| 47 | * arguments. Recovery via @longjmp@ or a similar machanism is | |
| 48 | * acceptable. | |
| 49 | */ | |
| 50 | ||
| 51 | void kw_unknown(const char *set, const char *kw) | |
| 52 | { kw_unkhook(set, kw); kw__hookfailed(); } | |
| 53 | ||
| 54 | /* --- @kw_parseempty@ --- * | |
| 55 | * | |
| 56 | * Arguments: @const char *set@ = the keyword set name, as a string | |
| 57 | * @const char *kwfirst@ = the first keyword argument name | |
| 58 | * @va_list *ap@ = pointer to argument-tail extraction state | |
| 59 | * @const struct kwval *v@ = base address of argument vector | |
| 60 | * @size_t n@ = size of argument vector | |
| 61 | * | |
| 62 | * Returns: --- | |
| 63 | * | |
| 64 | * Use: Goes through the motions of parsing keyword arguments, but | |
| 65 | * doesn't in fact handle any other than the standard ones | |
| 66 | * described above (see @KWSET_PARSEFN@). This is useful when a | |
| 67 | * function doesn't currently define any keyword arguments but | |
| 68 | * wants to reserve the right to define some in the future. | |
| 69 | * (The usual machinery can't be used in this case, since the | |
| 70 | * argument structure would be empty. Besides, it would be | |
| 71 | * pointless to include multiple copies of the same boilerplate | |
| 72 | * code in a program.) | |
| 73 | */ | |
| 74 | ||
| 75 | void kw_parseempty(const char *set, const char *kwfirst, va_list *ap, | |
| 76 | const struct kwval *v, size_t n) | |
| 77 | { | |
| 78 | const char *k, *kk; | |
| 79 | va_list *aap; | |
| 80 | const struct kwtab *t; | |
| 81 | const struct kwval *vv; | |
| 82 | size_t nn; | |
| 83 | ||
| 84 | for (k = kwfirst; k; k = va_arg(*ap, const char *)) { | |
| 85 | if (!strcmp(k, "kw.va_list")) { | |
| 86 | aap = va_arg(*ap, va_list *); | |
| 87 | kk = va_arg(*aap, const char *); | |
| 88 | kw_parseempty(set, kk, aap, 0, 0); | |
| 89 | } else if (!strcmp(k, "kw.tab")) { | |
| 90 | vv = va_arg(*ap, const struct kwval *); | |
| 91 | nn = va_arg(*ap, size_t); | |
| 92 | kw_parseempty(set, 0, 0, vv, nn); | |
| 93 | } else | |
| 94 | kw_unknown(set, k); | |
| 95 | } | |
| 96 | while (n) { | |
| 97 | if (!strcmp(v->kw, "kw.va_list")) { | |
| 98 | aap = *(va_list *const *)v->val; | |
| 99 | kk = va_arg(*aap, const char *); | |
| 100 | kw_parseempty(set, kk, aap, 0, 0); | |
| 101 | } else if (!strcmp(k, "kw.tab")) { | |
| 102 | t = (const struct kwtab *)v->val; | |
| 103 | kw_parseempty(set, 0, 0, t->v, t->n); | |
| 104 | } else | |
| 105 | kw_unknown(set, k); | |
| 106 | v++; n--; | |
| 107 | } | |
| 108 | } | |
| 109 | ||
| 110 | /*----- That's all, folks -------------------------------------------------*/ |