varnish-cache/vmod/vmod_std_conversions.c
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/*-
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 * Copyright (c) 2010-2015 Varnish Software AS
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 * All rights reserved.
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 *
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 * Author: Poul-Henning Kamp <phk@FreeBSD.org>
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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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 */
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#include "config.h"
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include "cache/cache.h"
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#include "vnum.h"
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#include "vsa.h"
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#include "vss.h"
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#include "vtim.h"
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#include "vcc_std_if.h"
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48
/*
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 * technically, as our VCL_INT is int64_t, its limits are INT64_MIN
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 * .. INT64_MAX.
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 *
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 * We redistrict to VRT_INTEGER_MIN .. VRT_INTEGER_MAX
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 */
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/* limited by using double for conversions */
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#define VCL_BYTES_MAX ((INT64_C(1)<<53)-1)
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static
59 812
int onearg(VRT_CTX, const char *f, int nargs)
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{
61 812
        if (nargs == 1)
62 808
                return (1);
63 8
        VRT_fail(ctx, "std.%s: %s arguments", f,
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            nargs > 1 ? "too many" : "not enough");
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        return (0);
66 812
}
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/*
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 * not handling real arg isfinite() / nan() : caller error
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 * always trunc, never round
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 */
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VCL_DURATION v_matchproto_(td_std_duration)
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vmod_duration(VRT_CTX, struct VARGS(duration) *a)
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{
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        double r;
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        int nargs;
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79 108
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
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81 108
        nargs = a->valid_s + a->valid_real + a->valid_integer;
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83 108
        if (!onearg(ctx, "duration", nargs))
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                return (0);
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86 108
        if (a->valid_real)
87 12
                return ((VCL_DURATION)a->real);
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89 96
        if (a->valid_integer)
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                return ((VCL_DURATION)a->integer);
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92 88
        if (a->valid_s) {
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                r = VNUM_duration(a->s);
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                if (!isnan(r))
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                        return (r);
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        }
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98 40
        if (a->valid_fallback)
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                return (a->fallback);
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101 12
        VRT_fail(ctx, "std.duration: conversion failed");
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        return (0);
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}
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VCL_BYTES v_matchproto_(td_std_bytes)
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vmod_bytes(VRT_CTX, struct VARGS(bytes) *a)
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{
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        uintmax_t r;
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        VCL_REAL rr;
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        int nargs;
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        const char *errtxt;
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113 64
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
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        nargs = a->valid_s + a->valid_real + a->valid_integer;
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117 64
        if (!onearg(ctx, "bytes", nargs))
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                return (0);
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120 64
        if (a->valid_s) {
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                errtxt = VNUM_2bytes(a->s, &r, 0);
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                if (errtxt == NULL && r <= VCL_BYTES_MAX)
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                        return ((VCL_BYTES)r);
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        }
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126 42
        if (a->valid_real && !isnan(a->real) && a->real >= 0) {
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                rr = trunc(a->real);
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                if (rr <= (VCL_REAL)VCL_BYTES_MAX)
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                        return ((VCL_BYTES)rr);
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        }
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132 32
        if (a->valid_integer && a->integer >= 0)
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                return ((VCL_BYTES)a->integer);
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135 26
        if (a->valid_fallback)
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                return (a->fallback);
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138 2
        VRT_fail(ctx, "std.bytes: conversion failed");
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        return (0);
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}
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VCL_INT v_matchproto_(td_std_integer)
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vmod_integer(VRT_CTX, struct VARGS(integer) *a)
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{
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        const char *p, *errtxt = NULL;
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        double r, tmp;
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        int nargs;
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        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
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        nargs = a->valid_s + a->valid_boolean + a->valid_bytes +
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            a->valid_duration + a->valid_real + a->valid_time;
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        if (!onearg(ctx, "integer", nargs))
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                return (0);
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        r = NAN;
158 300
        if (a->valid_boolean)
159 2
                return (a->boolean ? 1 : 0);
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161 298
        if (a->valid_bytes)
162 4
                return (a->bytes);
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164 294
        if (a->valid_s && a->s != NULL) {
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                p = a->s;
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                r = SF_Parse_Number(&p, 0, &errtxt);
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                if (!errno && *p == '\0' && modf(r, &tmp) == 0.0)
168 180
                        return ((VCL_INT)r);
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                r = NAN;
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        }
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172 114
        if (a->valid_duration)
173 6
                r = a->duration;
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175 114
        if (a->valid_real)
176 18
                r = a->real;
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178 114
        if (a->valid_time)
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                r = a->time;
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181 114
        if (!isnan(r)) {
182 36
                r = trunc(r);
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                if (r >= VRT_INTEGER_MIN && r <= VRT_INTEGER_MAX)
184 32
                        return ((VCL_INT)r);
185 4
        }
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187 82
        if (a->valid_fallback)
188 72
                return (a->fallback);
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190 10
        if (errtxt != NULL)
191 4
                VRT_fail(ctx, "std.integer: conversion failed: %s", errtxt);
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        else
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                VRT_fail(ctx, "std.integer: conversion failed");
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        return (0);
195 304
}
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VCL_IP
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vmod_ip(VRT_CTX, struct VARGS(ip) *a)
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{
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        uintptr_t sn;
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        void *p;
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        VCL_IP retval = NULL, fb = bogo_ip;
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204 182
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
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206 182
        if (a->valid_fallback) {
207 48
                if (a->fallback == NULL || !VSA_Sane(a->fallback)) {
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                        VRT_fail(ctx, "std.ip: invalid fallback");
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                        return (fb);
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                }
211 48
                fb = a->fallback;
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        }
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        sn = WS_Snapshot(ctx->ws);
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        p = WS_Alloc(ctx->ws, vsa_suckaddr_len);
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        if (p == NULL) {
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                VRT_fail(ctx, "std.ip: insufficient workspace");
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                return (fb);
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        }
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        if (a->s != NULL)
222 180
                retval = VSS_ResolveFirst(
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                    p, a->s, a->valid_p ? a->p : "80",
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                    AF_UNSPEC, SOCK_STREAM,
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                    a->resolve ? 0 : AI_NUMERICHOST|AI_NUMERICSERV);
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227 182
        if (retval != NULL)
228 154
                return (retval);
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230 28
        WS_Reset(ctx->ws, sn);
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232 28
        if (!a->valid_fallback)
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                VRT_fail(ctx, "std.ip: conversion failed");
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        return (fb);
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}
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VCL_REAL v_matchproto_(td_std_real)
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vmod_real(VRT_CTX, struct VARGS(real) *a)
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{
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        VCL_REAL r;
242 124
        const char *p, *errtxt = NULL;
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        int nargs;
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245 124
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
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247 372
        nargs = a->valid_s + a->valid_integer + a->valid_boolean + a->valid_bytes +
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            a->valid_duration + a->valid_time;
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250 124
        if (!onearg(ctx, "real", nargs))
251 0
                return (0);
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        if (a->valid_integer)
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                return ((VCL_REAL)a->integer);
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256 118
        if (a->valid_boolean)
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                return ((VCL_REAL)(a->boolean ? 1 : 0));
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        if (a->valid_bytes)
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                return ((VCL_REAL)a->bytes);
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        if (a->valid_duration)
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                return ((VCL_REAL)a->duration);
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        if (a->valid_time)
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                return ((VCL_REAL)a->time);
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        if (a->valid_s && a->s != NULL) {
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                p = a->s;
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                r = SF_Parse_Decimal(&p, 0, &errtxt);
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                if (!errno && *p == '\0')
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                        return (r);
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        }
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        if (a->valid_fallback)
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                return (a->fallback);
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        if (errtxt != NULL)
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                VRT_fail(ctx, "std.real: conversion failed: %s", errtxt);
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        else
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                VRT_fail(ctx, "std.real: conversion failed");
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        return (0);
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}
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VCL_REAL v_matchproto_(td_std_round)
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vmod_round(VRT_CTX, VCL_REAL r)
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{
288 4
        (void) ctx;
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        return (round(r));
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}
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VCL_TIME v_matchproto_(td_std_time)
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vmod_time(VRT_CTX, struct VARGS(time)* a)
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{
295
        double r;
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        int nargs;
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298 212
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
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300 212
        nargs = a->valid_s + a->valid_real + a->valid_integer;
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302 212
        if (!onearg(ctx, "time", nargs))
303 0
                return (0);
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305 212
        if (a->valid_integer)
306 4
                return ((VCL_REAL)a->integer);
307
308 208
        if (a->valid_real)
309 18
                return ((VCL_REAL)a->real);
310
311 190
        if (a->valid_s && a->s != NULL) {
312 184
                r = VTIM_parse(a->s);
313 184
                if (r)
314 60
                        return (r);
315
316 124
                r = VNUM(a->s);
317
318 124
                if (!isnan(r) && r > 0)
319 28
                        return (r);
320 96
        }
321
322 102
        if (a->valid_fallback)
323 102
                return (a->fallback);
324
325 0
        VRT_fail(ctx, "std.time: conversion failed");
326 0
        return (0);
327 212
}
328
329
VCL_STRING v_matchproto_(td_std_strftime)
330 44
vmod_strftime(VRT_CTX, VCL_TIME t, VCL_STRING fmt)
331
{
332
        struct tm tm;
333
        time_t tt;
334
        size_t r;
335
        unsigned spc;
336
        char *s;
337
338 44
        CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
339
340 44
        tt = (time_t)(intmax_t)t;
341 44
        if (gmtime_r(&tt, &tm) == NULL)
342 0
                return ("");
343
344 44
        spc = WS_ReserveAll(ctx->ws);
345 44
        s = WS_Reservation(ctx->ws);
346 44
        r = strftime(s, spc, fmt, &tm);
347 44
        if (r == 0) {
348 2
                WS_Release(ctx->ws, 0);
349 2
                return ("");
350
        }
351 42
        r++;
352 42
        WS_Release(ctx->ws, r);
353 42
        return (s);
354 44
}