summaryrefslogtreecommitdiffstats
path: root/crypto/heimdal/lib/roken/parse_units.c
blob: 217d55ede8a6488c001fd89c7e23261ff79c793b (plain)
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
/*
 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$Id: parse_units.c,v 1.14 2001/09/04 09:56:00 assar Exp $");
#endif

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <roken.h>
#include "parse_units.h"

/*
 * Parse string in `s' according to `units' and return value.
 * def_unit defines the default unit.
 */

static int
parse_something (const char *s, const struct units *units,
		 const char *def_unit,
		 int (*func)(int res, int val, unsigned mult),
		 int init,
		 int accept_no_val_p)
{
    const char *p;
    int res = init;
    unsigned def_mult = 1;

    if (def_unit != NULL) {
	const struct units *u;

	for (u = units; u->name; ++u) {
	    if (strcasecmp (u->name, def_unit) == 0) {
		def_mult = u->mult;
		break;
	    }
	}
	if (u->name == NULL)
	    return -1;
    }

    p = s;
    while (*p) {
	double val;
	char *next;
	const struct units *u, *partial_unit;
	size_t u_len;
	unsigned partial;
	int no_val_p = 0;

	while(isspace((unsigned char)*p) || *p == ',')
	    ++p;

	val = strtod (p, &next); /* strtol(p, &next, 0); */
	if (p == next) {
	    val = 0;
	    if(!accept_no_val_p)
		return -1;
	    no_val_p = 1;
	}
	p = next;
	while (isspace((unsigned char)*p))
	    ++p;
	if (*p == '\0') {
	    res = (*func)(res, val, def_mult);
	    if (res < 0)
		return res;
	    break;
	} else if (*p == '+') {
	    ++p;
	    val = 1;
	} else if (*p == '-') {
	    ++p;
	    val = -1;
	}
	if (no_val_p && val == 0)
	    val = 1;
	u_len = strcspn (p, ", \t");
	partial = 0;
	partial_unit = NULL;
	if (u_len > 1 && p[u_len - 1] == 's')
	    --u_len;
	for (u = units; u->name; ++u) {
	    if (strncasecmp (p, u->name, u_len) == 0) {
		if (u_len == strlen (u->name)) {
		    p += u_len;
		    res = (*func)(res, val, u->mult);
		    if (res < 0)
			return res;
		    break;
		} else {
		    ++partial;
		    partial_unit = u;
		}
	    }
	}
	if (u->name == NULL) {
	    if (partial == 1) {
		p += u_len;
		res = (*func)(res, val, partial_unit->mult);
		if (res < 0)
		    return res;
	    } else {
		return -1;
	    }
	}
	if (*p == 's')
	    ++p;
    }
    return res;
}

/*
 * The string consists of a sequence of `n unit'
 */

static int
acc_units(int res, int val, unsigned mult)
{
    return res + val * mult;
}

int
parse_units (const char *s, const struct units *units,
	     const char *def_unit)
{
    return parse_something (s, units, def_unit, acc_units, 0, 0);
}

/*
 * The string consists of a sequence of `[+-]flag'.  `orig' consists
 * the original set of flags, those are then modified and returned as
 * the function value.
 */

static int
acc_flags(int res, int val, unsigned mult)
{
    if(val == 1)
	return res | mult;
    else if(val == -1)
	return res & ~mult;
    else if (val == 0)
	return mult;
    else
	return -1;
}

int
parse_flags (const char *s, const struct units *units,
	     int orig)
{
    return parse_something (s, units, NULL, acc_flags, orig, 1);
}

/*
 * Return a string representation according to `units' of `num' in `s'
 * with maximum length `len'.  The actual length is the function value.
 */

static int
unparse_something (int num, const struct units *units, char *s, size_t len,
		   int (*print) (char *s, size_t len, int div,
				const char *name, int rem),
		   int (*update) (int in, unsigned mult),
		   const char *zero_string)
{
    const struct units *u;
    int ret = 0, tmp;

    if (num == 0)
	return snprintf (s, len, "%s", zero_string);

    for (u = units; num > 0 && u->name; ++u) {
	int div;

	div = num / u->mult;
	if (div) {
	    num = (*update) (num, u->mult);
	    tmp = (*print) (s, len, div, u->name, num);
	    if (tmp < 0)
		return tmp;

	    len -= tmp;
	    s += tmp;
	    ret += tmp;
	}
    }
    return ret;
}

static int
print_unit (char *s, size_t len, int div, const char *name, int rem)
{
    return snprintf (s, len, "%u %s%s%s",
		     div, name,
		     div == 1 ? "" : "s",
		     rem > 0 ? " " : "");
}

static int
update_unit (int in, unsigned mult)
{
    return in % mult;
}

static int
update_unit_approx (int in, unsigned mult)
{
    if (in / mult > 0)
	return 0;
    else
	return update_unit (in, mult);
}

int
unparse_units (int num, const struct units *units, char *s, size_t len)
{
    return unparse_something (num, units, s, len,
			      print_unit,
			      update_unit,
			      "0");
}

int
unparse_units_approx (int num, const struct units *units, char *s, size_t len)
{
    return unparse_something (num, units, s, len,
			      print_unit,
			      update_unit_approx,
			      "0");
}

void
print_units_table (const struct units *units, FILE *f)
{
    const struct units *u, *u2;
    unsigned max_sz = 0;

    for (u = units; u->name; ++u) {
	max_sz = max(max_sz, strlen(u->name));
    }

    for (u = units; u->name;) {
	char buf[1024];
	const struct units *next;

	for (next = u + 1; next->name && next->mult == u->mult; ++next)
	    ;

	if (next->name) {
	    for (u2 = next;
		 u2->name && u->mult % u2->mult != 0;
		 ++u2)
		;
	    if (u2->name == NULL)
		--u2;
	    unparse_units (u->mult, u2, buf, sizeof(buf));
	    fprintf (f, "1 %*s = %s\n", max_sz, u->name, buf);
	} else {
	    fprintf (f, "1 %s\n", u->name);
	}
	u = next;
    }
}

static int
print_flag (char *s, size_t len, int div, const char *name, int rem)
{
    return snprintf (s, len, "%s%s", name, rem > 0 ? ", " : "");
}

static int
update_flag (int in, unsigned mult)
{
    return in - mult;
}

int
unparse_flags (int num, const struct units *units, char *s, size_t len)
{
    return unparse_something (num, units, s, len,
			      print_flag,
			      update_flag,
			      "");
}

void
print_flags_table (const struct units *units, FILE *f)
{
    const struct units *u;

    for(u = units; u->name; ++u)
	fprintf(f, "%s%s", u->name, (u+1)->name ? ", " : "\n");
}
OpenPOWER on IntegriCloud