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[heimdal.git] / lib / roken / parse_units.c
bloba68cb247f6a9ff96320e7a7808e9cb5b823665d8
1 /*
2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 RCSID("$Id$");
37 #endif
39 #include <stdio.h>
40 #include <ctype.h>
41 #include <string.h>
42 #include "roken.h"
43 #include "parse_units.h"
46 * Parse string in `s' according to `units' and return value.
47 * def_unit defines the default unit.
50 static int
51 parse_something (const char *s, const struct units *units,
52 const char *def_unit,
53 int (*func)(int res, int val, unsigned mult),
54 int init,
55 int accept_no_val_p)
57 const char *p;
58 int res = init;
59 unsigned def_mult = 1;
61 if (def_unit != NULL) {
62 const struct units *u;
64 for (u = units; u->name; ++u) {
65 if (strcasecmp (u->name, def_unit) == 0) {
66 def_mult = u->mult;
67 break;
70 if (u->name == NULL)
71 return -1;
74 p = s;
75 while (*p) {
76 double val;
77 char *next;
78 const struct units *u, *partial_unit;
79 size_t u_len;
80 unsigned partial;
81 int no_val_p = 0;
83 while(isspace((unsigned char)*p) || *p == ',')
84 ++p;
86 val = strtod (p, &next); /* strtol(p, &next, 0); */
87 if (p == next) {
88 val = 0;
89 if(!accept_no_val_p)
90 return -1;
91 no_val_p = 1;
93 p = next;
94 while (isspace((unsigned char)*p))
95 ++p;
96 if (*p == '\0') {
97 res = (*func)(res, val, def_mult);
98 if (res < 0)
99 return res;
100 break;
101 } else if (*p == '+') {
102 ++p;
103 val = 1;
104 } else if (*p == '-') {
105 ++p;
106 val = -1;
108 if (no_val_p && val == 0)
109 val = 1;
110 u_len = strcspn (p, ", \t");
111 partial = 0;
112 partial_unit = NULL;
113 if (u_len > 1 && p[u_len - 1] == 's')
114 --u_len;
115 for (u = units; u->name; ++u) {
116 if (strncasecmp (p, u->name, u_len) == 0) {
117 if (u_len == strlen (u->name)) {
118 p += u_len;
119 res = (*func)(res, val, u->mult);
120 if (res < 0)
121 return res;
122 break;
123 } else {
124 ++partial;
125 partial_unit = u;
129 if (u->name == NULL) {
130 if (partial == 1) {
131 p += u_len;
132 res = (*func)(res, val, partial_unit->mult);
133 if (res < 0)
134 return res;
135 } else {
136 return -1;
139 if (*p == 's')
140 ++p;
142 return res;
146 * The string consists of a sequence of `n unit'
149 static int
150 acc_units(int res, int val, unsigned mult)
152 return res + val * mult;
155 int ROKEN_LIB_FUNCTION
156 parse_units (const char *s, const struct units *units,
157 const char *def_unit)
159 return parse_something (s, units, def_unit, acc_units, 0, 0);
163 * The string consists of a sequence of `[+-]flag'. `orig' consists
164 * the original set of flags, those are then modified and returned as
165 * the function value.
168 static int
169 acc_flags(int res, int val, unsigned mult)
171 if(val == 1)
172 return res | mult;
173 else if(val == -1)
174 return res & ~mult;
175 else if (val == 0)
176 return mult;
177 else
178 return -1;
181 int ROKEN_LIB_FUNCTION
182 parse_flags (const char *s, const struct units *units,
183 int orig)
185 return parse_something (s, units, NULL, acc_flags, orig, 1);
189 * Return a string representation according to `units' of `num' in `s'
190 * with maximum length `len'. The actual length is the function value.
193 static int
194 unparse_something (int num, const struct units *units, char *s, size_t len,
195 int (*print) (char *, size_t, int, const char *, int),
196 int (*update) (int, unsigned),
197 const char *zero_string)
199 const struct units *u;
200 int ret = 0, tmp;
202 if (num == 0)
203 return snprintf (s, len, "%s", zero_string);
205 for (u = units; num > 0 && u->name; ++u) {
206 int divisor;
208 divisor = num / u->mult;
209 if (divisor) {
210 num = (*update) (num, u->mult);
211 tmp = (*print) (s, len, divisor, u->name, num);
212 if (tmp < 0)
213 return tmp;
214 if (tmp > len) {
215 len = 0;
216 s = NULL;
217 } else {
218 len -= tmp;
219 s += tmp;
221 ret += tmp;
224 return ret;
227 static int
228 print_unit (char *s, size_t len, int divisor, const char *name, int rem)
230 return snprintf (s, len, "%u %s%s%s",
231 divisor, name,
232 divisor == 1 ? "" : "s",
233 rem > 0 ? " " : "");
236 static int
237 update_unit (int in, unsigned mult)
239 return in % mult;
242 static int
243 update_unit_approx (int in, unsigned mult)
245 if (in / mult > 0)
246 return 0;
247 else
248 return update_unit (in, mult);
251 int ROKEN_LIB_FUNCTION
252 unparse_units (int num, const struct units *units, char *s, size_t len)
254 return unparse_something (num, units, s, len,
255 print_unit,
256 update_unit,
257 "0");
260 int ROKEN_LIB_FUNCTION
261 unparse_units_approx (int num, const struct units *units, char *s, size_t len)
263 return unparse_something (num, units, s, len,
264 print_unit,
265 update_unit_approx,
266 "0");
269 void ROKEN_LIB_FUNCTION
270 print_units_table (const struct units *units, FILE *f)
272 const struct units *u, *u2;
273 unsigned max_sz = 0;
275 for (u = units; u->name; ++u) {
276 max_sz = max(max_sz, strlen(u->name));
279 for (u = units; u->name;) {
280 char buf[1024];
281 const struct units *next;
283 for (next = u + 1; next->name && next->mult == u->mult; ++next)
286 if (next->name) {
287 for (u2 = next;
288 u2->name && u->mult % u2->mult != 0;
289 ++u2)
291 if (u2->name == NULL)
292 --u2;
293 unparse_units (u->mult, u2, buf, sizeof(buf));
294 fprintf (f, "1 %*s = %s\n", max_sz, u->name, buf);
295 } else {
296 fprintf (f, "1 %s\n", u->name);
298 u = next;
302 static int
303 print_flag (char *s, size_t len, int divisor, const char *name, int rem)
305 return snprintf (s, len, "%s%s", name, rem > 0 ? ", " : "");
308 static int
309 update_flag (int in, unsigned mult)
311 return in - mult;
314 int ROKEN_LIB_FUNCTION
315 unparse_flags (int num, const struct units *units, char *s, size_t len)
317 return unparse_something (num, units, s, len,
318 print_flag,
319 update_flag,
320 "");
323 void ROKEN_LIB_FUNCTION
324 print_flags_table (const struct units *units, FILE *f)
326 const struct units *u;
328 for(u = units; u->name; ++u)
329 fprintf(f, "%s%s", u->name, (u+1)->name ? ", " : "\n");