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/*
* Copyright 2019-2021 OARC, Inc.
* Copyright 2017-2018 Akamai Technologies
* Copyright 2006-2016 Nominum, Inc.
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "opt.h"
#include "log.h"
#include "util.h"
#include "result.h"
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <netinet/in.h>
#define MAX_OPTS 64
#define LINE_LENGTH 80
typedef struct {
char c;
perf_opttype_t type;
const char* desc;
const char* help;
const char* defval;
char defvalbuf[32];
union {
void* valp;
char** stringp;
bool* boolp;
unsigned int* uintp;
uint64_t* uint64p;
double* doublep;
in_port_t* portp;
} u;
} opt_t;
static opt_t opts[MAX_OPTS];
static unsigned int nopts;
static char optstr[MAX_OPTS * 2 + 2 + 1] = { 0 };
extern const char* progname;
void perf_opt_add(char c, perf_opttype_t type, const char* desc, const char* help,
const char* defval, void* valp)
{
opt_t* opt;
if (nopts == MAX_OPTS) {
perf_log_fatal("too many defined options");
return;
}
opt = &opts[nopts++];
opt->c = c;
opt->type = type;
opt->desc = desc;
opt->help = help;
if (defval != NULL) {
opt->defvalbuf[sizeof(opt->defvalbuf) - 1] = 0;
strncpy(opt->defvalbuf, defval, sizeof(opt->defvalbuf));
if (opt->defvalbuf[sizeof(opt->defvalbuf) - 1]) {
perf_log_fatal("perf_opt_add(): defval too large");
return;
}
opt->defval = opt->defvalbuf;
} else {
opt->defval = NULL;
}
opt->u.valp = valp;
char newoptstr[sizeof(optstr) + 2];
snprintf(newoptstr, sizeof(newoptstr), "%s%c%s", optstr, c, (type == perf_opt_boolean ? "" : ":"));
memcpy(optstr, newoptstr, sizeof(optstr) - 1);
optstr[sizeof(optstr) - 1] = 0;
}
void perf_opt_usage(void)
{
unsigned int prefix_len, position, arg_len, i, j;
prefix_len = fprintf(stderr, "Usage: %s", progname);
position = prefix_len;
for (i = 0; i < nopts; i++) {
arg_len = 6;
if (opts[i].desc != NULL)
arg_len += strlen(opts[i].desc) + 1;
if (LINE_LENGTH - position - 1 < arg_len) {
fprintf(stderr, "\n");
for (j = 0; j < prefix_len; j++)
fprintf(stderr, " ");
position = prefix_len;
}
fprintf(stderr, " [-%c", opts[i].c);
if (opts[i].desc != NULL)
fprintf(stderr, " %s", opts[i].desc);
fprintf(stderr, "]");
position += arg_len;
}
fprintf(stderr, "\n");
for (i = 0; i < nopts; i++) {
fprintf(stderr, " -%c %s", opts[i].c, opts[i].help);
if (opts[i].defval)
fprintf(stderr, " (default: %s)", opts[i].defval);
fprintf(stderr, "\n");
}
}
static uint32_t
parse_uint(const char* desc, const char* str,
unsigned int min, unsigned int max)
{
unsigned long int val;
uint32_t ret;
char* endptr = 0;
errno = 0;
val = strtoul(str, &endptr, 10);
if (!errno && str && *str && endptr && !*endptr && val <= UINT32_MAX) {
ret = (uint32_t)val;
if (ret >= min && ret <= max) {
return ret;
}
}
fprintf(stderr, "invalid %s: %s\n", desc, str);
perf_opt_usage();
exit(1);
}
static double
parse_double(const char* desc, const char* str)
{
const char* s;
char c;
bool seen_dot = false;
s = str;
while (*s != 0) {
c = *s++;
if (c == '.') {
if (seen_dot)
goto fail;
seen_dot = true;
} else if (c < '0' || c > '9') {
goto fail;
}
}
return atof(str);
fail:
fprintf(stderr, "invalid %s: %s\n", desc, str);
perf_opt_usage();
exit(1);
}
static uint64_t
parse_timeval(const char* desc, const char* str)
{
return MILLION * parse_double(desc, str);
}
void perf_opt_parse(int argc, char** argv)
{
int c;
opt_t* opt;
unsigned int i;
perf_opt_add('h', perf_opt_boolean, NULL, "print this help", NULL, NULL);
while ((c = getopt(argc, argv, optstr)) != -1) {
for (i = 0; i < nopts; i++) {
if (opts[i].c == c)
break;
}
if (i == nopts) {
perf_opt_usage();
exit(1);
}
if (c == 'h') {
perf_opt_usage();
exit(0);
}
opt = &opts[i];
switch (opt->type) {
case perf_opt_string:
*opt->u.stringp = optarg;
break;
case perf_opt_boolean:
*opt->u.boolp = true;
break;
case perf_opt_uint:
*opt->u.uintp = parse_uint(opt->desc, optarg,
1, 0xFFFFFFFF);
break;
case perf_opt_timeval:
*opt->u.uint64p = parse_timeval(opt->desc, optarg);
break;
case perf_opt_double:
*opt->u.doublep = parse_double(opt->desc, optarg);
break;
case perf_opt_port:
*opt->u.portp = parse_uint(opt->desc, optarg,
0, 0xFFFF);
break;
}
}
if (optind != argc) {
fprintf(stderr, "unexpected argument %s\n", argv[optind]);
perf_opt_usage();
exit(1);
}
}
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