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1 | /* -*-c-*- |
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2 | * |
3 | * Quick-and-dirty parser |
4 | * |
5 | * (c) 2004 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb 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. |
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16 | * |
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17 | * Catacomb 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. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <ctype.h> |
31 | #include <string.h> |
32 | |
33 | #include "qdparse.h" |
34 | |
35 | /*----- Main code ---------------------------------------------------------*/ |
36 | |
37 | /* --- @qd_skipspc@ --- * |
38 | * |
39 | * Arguments: @qd_parse *qd@ = context |
40 | * |
41 | * Returns: --- |
42 | * |
43 | * Use: Skips spaces in the string. No errors. |
44 | */ |
45 | |
46 | void qd_skipspc(qd_parse *qd) |
47 | { |
48 | while (isspace((unsigned char)*qd->p)) |
49 | qd->p++; |
50 | } |
51 | |
52 | /* --- @qd_delim@ --- * |
53 | * |
54 | * Arguments: @qd_parse *qd@ = context |
55 | * @int ch@ = character to compare with |
56 | * |
57 | * Returns: Nonzero if it was, zero if it wasn't. |
58 | * |
59 | * Use: Checks the next (non-whitespace) character is what we |
60 | * expect. If it is, the character is eaten; otherwise it's no |
61 | * big deal. |
62 | */ |
63 | |
64 | int qd_delim(qd_parse *qd, int ch) |
65 | { |
66 | qd_skipspc(qd); |
67 | if (*qd->p != ch) |
68 | return (0); |
69 | qd->p++; |
70 | return (1); |
71 | } |
72 | |
73 | /* --- @qd_enum@ --- * |
74 | * |
75 | * Arguments: @qd_parse *qd@ = context |
76 | * @const char *e@ = list of enum strings, space separated |
77 | * |
78 | * Returns: Index of the string matched, or @-1@. |
79 | * |
80 | * Use: Matches a keyword. |
81 | */ |
82 | |
83 | int qd_enum(qd_parse *qd, const char *e) |
84 | { |
85 | size_t n; |
86 | int i = 0; |
87 | |
88 | qd_skipspc(qd); |
89 | for (;;) { |
90 | e += strspn(e, ", "); |
91 | if (!*e) break; |
92 | n = strcspn(e, ", "); |
93 | if (strncmp(qd->p, e, n) == 0 && !isalnum((unsigned char)qd->p[n])) { |
94 | qd->p += n; |
95 | return (i); |
96 | } |
97 | i++; e += n; |
98 | } |
99 | qd->e = "unrecognized keyword"; |
100 | return (-1); |
101 | } |
102 | |
103 | /* --- @qd_getmp@ --- * |
104 | * |
105 | * Arguments: @qd_parse *qd@ = context |
106 | * |
107 | * Returns: The integer extracted, or null. |
108 | * |
109 | * Use: Parses a multiprecision integer from a string. |
110 | */ |
111 | |
112 | mp *qd_getmp(qd_parse *qd) |
113 | { |
114 | char *q; |
115 | mp *m; |
116 | |
117 | qd_skipspc(qd); |
118 | m = mp_readstring(MP_NEW, qd->p, &q, 0); |
119 | if (m && !isalnum((unsigned char)*q)) |
120 | qd->p = q; |
121 | else { |
122 | mp_drop(m); |
123 | qd->e = "bad number"; |
124 | } |
125 | return (m); |
126 | } |
127 | |
128 | /* --- @qd_eofp@ --- * |
129 | * |
130 | * Arguments: @qd_parse *qd@ = context |
131 | * |
132 | * Returns: Nonzero if at EOF, zero otherwise. |
133 | */ |
134 | |
135 | int qd_eofp(qd_parse *qd) |
136 | { |
137 | qd_skipspc(qd); |
138 | return (!*qd->p); |
139 | } |
140 | |
141 | /*----- That's all, folks -------------------------------------------------*/ |