varnish-cache/lib/libvarnishapi/vsl_arg.c
0
/*-
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 * Copyright (c) 2006 Verdens Gang AS
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 * Copyright (c) 2006-2015 Varnish Software AS
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 * All rights reserved.
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 *
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 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
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 * Author: Martin Blix Grydeland <martin@varnish-software.com>
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 *
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 * SPDX-License-Identifier: BSD-2-Clause
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include "config.h"
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#include <ctype.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "vdef.h"
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#include "vas.h"
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#include "miniobj.h"
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44
#include "vbm.h"
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#include "vnum.h"
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#include "vqueue.h"
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#include "vre.h"
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#include "vsb.h"
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#include "vapi/vsl.h"
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#include "vsl_api.h"
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54
/*--------------------------------------------------------------------
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 * Look up a tag
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 *   0..255     tag number
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 *   -1         no tag matches
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 *   -2         multiple tags match
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 */
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61
int
62 5625
VSL_Name2Tag(const char *name, int l)
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{
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        int i, n;
65
66 5625
        if (l == -1)
67 531
                l = strlen(name);
68 5625
        n = -1;
69 257097
        for (i = 0; i < SLT__MAX; i++) {
70 257049
                if (VSL_tags[i] != NULL &&
71 243648
                    !strncasecmp(name, VSL_tags[i], l)) {
72 5679
                        if (strlen(VSL_tags[i]) == l) {
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                                /* Exact match */
74 5577
                                return (i);
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                        }
76 102
                        if (n == -1)
77 12
                                n = i;
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                        else
79 90
                                n = -2;
80 102
                }
81 251472
        }
82 48
        return (n);
83 5625
}
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int
86 705
VSL_Glob2Tags(const char *glob, int l, VSL_tagfind_f *func, void *priv)
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{
88 705
        const char *p1 = NULL;
89 705
        const char *p2 = NULL;
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        const char *e, *p;
91 705
        int i, l1 = 0, l2 = 0, r = 0;
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93 705
        AN(glob);
94 705
        if (l >= 0)
95 177
                e = glob + l;
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        else
97 528
                e = strchr(glob, '\0');
98 705
        if (glob == e)
99 6
                return (-1);            // Empty pattern cannot match
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101 5700
        for (p = glob; p < e; p++)
102 5064
                if (*p == '*')
103 63
                        break;
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105 699
        if (p == e) {                   // No wildcard
106 636
                i = VSL_Name2Tag(glob, l);
107 636
                if (i < 0)
108 27
                        return (i);
109 609
                if (func != NULL)
110 609
                        (func)(i, priv);
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                return (1);
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        }
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114 63
        if (p != glob) {                // Prefix match
115 42
                p1 = glob;
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                l1 = p - p1;
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        }
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119 63
        if (p != e - 1) {               // Postfix match
120 30
                p2 = p + 1;
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                l2 = e - p2;
122 30
        }
123
124 120
        for (p++; p < e; p++)
125 75
                if (*p == '*')
126 18
                        return (-3);    // More than one wildcard
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128 11565
        for (i = 0; i < SLT__MAX; i++) {
129 11520
                p = VSL_tags[i];
130 11520
                if (p == NULL)
131 7335
                        continue;
132 4185
                e = strchr(p, '\0');
133 4185
                if ((e - p) - l1 < l2)
134 294
                        continue;
135 3891
                if (p1 != NULL && strncasecmp(p, p1, l1))
136 2823
                        continue;
137 1068
                if (p2 != NULL && strncasecmp(e - l2, p2, l2))
138 480
                        continue;
139 588
                if (func != NULL)
140 588
                        (func)(i, priv);
141 588
                r++;
142 588
        }
143 45
        if (r == 0)
144 3
                return (-1);
145 42
        return (r);
146 705
}
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int
149 138
VSL_List2Tags(const char *list, int l, VSL_tagfind_f *func, void *priv)
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{
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        const char *p, *b, *e;
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        int r, t = 0;
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154 138
        p = list;
155 138
        if (l >= 0)
156 9
                e = p + l;
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        else
158 129
                e = strchr(p, '\0');
159 288
        while (p < e) {
160 225
                while (p < e && *p == ',')
161 48
                        p++;
162 177
                if (p == e)
163 3
                        break;
164 174
                b = p;
165 1152
                while (p < e && *p != ',')
166 978
                        p++;
167 174
                r = VSL_Glob2Tags(b, p - b, func, priv);
168 174
                if (r < 0)
169 24
                        return (r);
170 150
                t += r;
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        }
172 114
        if (t == 0)
173 3
                return (-1);
174 111
        return (t);
175 138
}
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const char *VSLQ_grouping[VSL_g__MAX] = {
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        [VSL_g_raw]     = "raw",
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        [VSL_g_vxid]    = "vxid",
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        [VSL_g_request] = "request",
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        [VSL_g_session] = "session",
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};
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int
185 675
VSLQ_Name2Grouping(const char *name, int l)
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{
187
        int i, n;
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189 675
        AN(name);
190 675
        if (l == -1)
191 42
                l = strlen(name);
192 675
        n = -1;
193 1209
        for (i = 0; i < VSL_g__MAX; i++) {
194 1203
                if (!strncasecmp(name, VSLQ_grouping[i], l)) {
195 675
                        if (strlen(VSLQ_grouping[i]) == l) {
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                                /* Exact match */
197 669
                                return (i);
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                        }
199 6
                        if (n == -1)
200 3
                                n = i;
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                        else
202 3
                                n = -2;
203 6
                }
204 534
        }
205 6
        return (n);
206 675
}
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void v_matchproto_(VSL_tagfind_f)
209 546
vsl_vbm_bitset(int bit, void *priv)
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{
211
212 546
        vbit_set((struct vbitmap *)priv, bit);
213 546
}
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void v_matchproto_(VSL_tagfind_f)
216 126
vsl_vbm_bitclr(int bit, void *priv)
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{
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219 126
        vbit_clr((struct vbitmap *)priv, bit);
220 126
}
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static int
223 114
vsl_ix_arg(struct VSL_data *vsl, int opt, const char *arg)
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{
225
        int i;
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227 114
        CHECK_OBJ_NOTNULL(vsl, VSL_MAGIC);
228 114
        vsl->flags |= F_SEEN_ixIX;
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230 228
        i = VSL_List2Tags(arg, -1, opt == 'x' ? vsl_vbm_bitset : vsl_vbm_bitclr,
231 114
            vsl->vbm_suppress);
232 114
        if (i == -1)
233 6
                return (vsl_diag(vsl, "-%c: \"%s\" matches zero tags",
234 3
                    (char)opt, arg));
235 111
        else if (i == -2)
236 6
                return (vsl_diag(vsl, "-%c: \"%s\" is ambiguous",
237 3
                    (char)opt, arg));
238 108
        else if (i == -3)
239 12
                return (vsl_diag(vsl, "-%c: Syntax error in \"%s\"",
240 6
                    (char)opt, arg));
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242 102
        return (1);
243 114
}
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static int
246 24
vsl_IX_arg(struct VSL_data *vsl, int opt, const char *arg)
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{
248
        int i, l, off, err;
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        const char *b, *e;
250
        vre_t *vre;
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        struct vsb vsb[1];
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        struct vslf *vslf;
253 24
        struct vbitmap *tags = NULL;
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        char errbuf[VRE_ERROR_LEN];
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257 24
        CHECK_OBJ_NOTNULL(vsl, VSL_MAGIC);
258 24
        AN(arg);
259 24
        vsl->flags |= F_SEEN_ixIX;
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261 24
        b = arg;
262 24
        e = strchr(b, ':');
263 24
        if (e) {
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                tags = vbit_new(SLT__MAX);
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                AN(tags);
266 9
                l = e - b;
267 9
                i = VSL_List2Tags(b, l, vsl_vbm_bitset, tags);
268 9
                if (i < 0)
269 9
                        vbit_destroy(tags);
270 9
                if (i == -1)
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                        return (vsl_diag(vsl,
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                            "-%c: \"%*.*s\" matches zero tags",
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                            (char)opt, l, l, b));
274 6
                else if (i == -2)
275 6
                        return (vsl_diag(vsl,
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                            "-%c: \"%*.*s\" is ambiguous",
277 3
                            (char)opt, l, l, b));
278 3
                else if (i <= -3)
279 6
                        return (vsl_diag(vsl,
280
                            "-%c: Syntax error in \"%*.*s\"",
281 3
                            (char)opt, l, l, b));
282 0
                b = e + 1;
283 0
        }
284
285 15
        vre = VRE_compile(b, vsl->C_opt ? VRE_CASELESS : 0, &err, &off, 1);
286 15
        if (vre == NULL) {
287 3
                if (tags)
288 0
                        vbit_destroy(tags);
289 3
                AN(VSB_init(vsb, errbuf, sizeof errbuf));
290 3
                AZ(VRE_error(vsb, err));
291 3
                AZ(VSB_finish(vsb));
292 3
                VSB_fini(vsb);
293 6
                return (vsl_diag(vsl, "-%c: Regex error at position %d (%s)",
294 3
                    (char)opt, off, errbuf));
295
        }
296
297 12
        ALLOC_OBJ(vslf, VSLF_MAGIC);
298 12
        AN(vslf);
299 12
        vslf->tags = tags;
300 12
        vslf->vre = vre;
301
302 12
        if (opt == 'I')
303 6
                VTAILQ_INSERT_TAIL(&vsl->vslf_select, vslf, list);
304
        else {
305 6
                assert(opt == 'X');
306 6
                VTAILQ_INSERT_TAIL(&vsl->vslf_suppress, vslf, list);
307
        }
308
309 12
        return (1);
310 24
}
311
312
static int
313 33
vsl_R_arg(struct VSL_data *vsl, const char *arg)
314
{
315 33
        char buf[32] = "";
316
        char *p;
317
        long l;
318
319 33
        AN(arg);
320 33
        CHECK_OBJ_NOTNULL(vsl, VSL_MAGIC);
321
322 33
        errno = 0;
323 33
        l = strtol(arg, &p, 0);
324 33
        if ((l == LONG_MIN || l == LONG_MAX) && errno == ERANGE)
325 0
                return (vsl_diag(vsl, "-R: Range error"));
326 33
        if (l <= 0 || l > INT_MAX)
327 9
                return (vsl_diag(vsl, "-R: Range error"));
328 24
        vsl->R_opt_l = l;
329 24
        assert(p != arg);
330 24
        AN(p);
331 24
        if (*p == '\0') {
332 0
                vsl->R_opt_p = 1.0;
333 0
                return (1);
334
        }
335 24
        if (*p != '/' || p[1] == '\0')
336 3
                return (vsl_diag(vsl, "-R: Syntax error"));
337 21
        p++;
338 21
        if (strlen(p) > sizeof(buf) - 2)
339 3
                return (vsl_diag(vsl, "-R: Syntax error"));
340 18
        if (!isdigit(*p))
341 9
                strcat(buf, "1");
342 18
        strcat(buf, p);
343 18
        vsl->R_opt_p = VNUM_duration(buf);
344 18
        if (isnan(vsl->R_opt_p) || vsl->R_opt_p <= 0.0)
345 12
                return (vsl_diag(vsl, "-R: Syntax error: Invalid duration"));
346 6
        return (1);
347 33
}
348
349
int
350 486
VSL_Arg(struct VSL_data *vsl, int opt, const char *arg)
351
{
352
        int i;
353
        char *p;
354
        double d;
355
        long l;
356
357 486
        CHECK_OBJ_NOTNULL(vsl, VSL_MAGIC);
358
        /* If first option is 'i', set all bits for suppression */
359 486
        if ((opt == 'i' || opt == 'I') && !(vsl->flags & F_SEEN_ixIX))
360 20817
                for (i = 0; i < SLT__MAX; i++)
361 20817
                        vbit_set(vsl->vbm_suppress, i);
362
363 486
        switch (opt) {
364 51
        case 'b': vsl->b_opt = 1; return (1);
365 216
        case 'c': vsl->c_opt = 1; return (1);
366
        case 'C':
367
                /* Caseless regular expressions */
368 6
                vsl->C_opt = 1;
369 6
                return (1);
370
        case 'E':
371 27
                vsl->E_opt = 1;
372 27
                vsl->c_opt = 1;
373 27
                return (1);
374 114
        case 'i': case 'x': return (vsl_ix_arg(vsl, opt, arg));
375 24
        case 'I': case 'X': return (vsl_IX_arg(vsl, opt, arg));
376
        case 'L':
377 3
                AN(arg);
378 3
                l = strtol(arg, &p, 0);
379 3
                while (isspace(*p))
380 0
                        p++;
381 3
                if (*p != '\0')
382 0
                        return (vsl_diag(vsl, "-L: Syntax error"));
383 3
                if (l <= 0 || l > INT_MAX)
384 3
                        return (vsl_diag(vsl, "-L: Range error"));
385 0
                vsl->L_opt = (int)l;
386 0
                return (1);
387
        case 'R':
388 33
                return (vsl_R_arg(vsl, arg));
389
        case 'T':
390 3
                AN(arg);
391 3
                d = VNUM(arg);
392 3
                if (isnan(d))
393 0
                        return (vsl_diag(vsl, "-T: Syntax error"));
394 3
                if (d < 0.)
395 0
                        return (vsl_diag(vsl, "-T: Range error"));
396 3
                vsl->T_opt = d;
397 3
                return (1);
398 3
        case 'v': vsl->v_opt = 1; return (1);
399
        default:
400 6
                return (0);
401
        }
402 486
}