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/* ==========================================================================
Licensed under BSD 2clause license. See LICENSE file for more information
Author: Michał Łyszczek <michal.lyszczek@bofc.pl>
========================================================================== */
/* ==== Include files ======================================================= */
#include "opts.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
#include "version.h"
/* ==== Private macros ====================================================== */
#define HAS_OPTARG() \
do \
{ \
if (*optarg == '\0') \
{ \
fprintf(stderr, "missing argument for option '%c'\n", opt); \
return -2; \
} \
} \
while (0);
/* ==== Global variables ==================================================== */
struct opts opts;
/* ==== Private functions =================================================== */
/* ==========================================================================
function resets 'opts' variable to default values
========================================================================== */
static void opts_reset(void)
{
opts.block_size = 16 * 1024;
opts.report_intvl = 100 * 1024 * 1024;
opts.num_intvl = 10;
opts.method = METHOD_MEMCPY;
opts.cache_size = 1 * 1024 * 1024;
#if HAVE_CLOCK_GETTIME
opts.clock = CLK_REALTIME;
#else
opts.clock = CLK_CLOCK;
#endif
}
/* ==========================================================================
returns argument from 'argv'. If passed 'argv' doesn't hold valid argument
-1 will be returned.
========================================================================== */
static char opts_get
(
char* argv /* pointer to option */
)
{
if (argv == NULL || argv[0] != '-' || islower(argv[1]) == 0)
{
return -1;
}
return argv[1];
}
/* ==========================================================================
Prints help message. Who would suspect?
Function uses more than one print, as ANSI C only requires compilers to
support at least 509 long string literal
========================================================================== */
static void opts_print_help(void)
{
printf(
"usage: memperf [-h | -v | options]\n"
"\n"
"arguments *MUST* be separated, ie -s -p is good while -sp is not\n"
"parameters must be next to argument like '-b1024' not '-b 1024'\n"
"\n"
"options:\n"
"\t-h this help message\n"
"\t-v prints version and exists\n"
"\t-b<mbytes> size of a single memory block\n"
"\t-r<mbytes> print report every 'mbytes' copied\n"
"\t-l<mbytes> size of the cpu cache, if 0 cache flush is disabled\n"
"\t-i<number> number of intervals\n"
);
printf(
"\t-m<method> copying method\n"
"\t-c<clock> clock to use to calculate bandwith\n"
"\n"
"methods:\n"
"\tmemcpy copy data using buildin memcpy function\n"
"\tbbb byte by byte copy, simple for loop\n"
"\n"
"clocks:\n"
#if HAVE_CLOCK_GETTIME
"\trealtime posix CLOCK_REALTIME clock is used\n"
#endif
"\tclock clock_t is used\n"
);
}
/* ==== Public functions ==================================================== */
/* ==========================================================================
resets global 'opts' object with default values, and parses input options
overwritting default settings. If help (-h) or version (-v) option is found
anywhere in the argv, program prints what first was found and returns with
code 1.
returns:
1 -h or -v was passed
0 all options parsed, program can continue
-1 syntax error (ie not started with '-')
-2 invalid argument for the option
-3 given option is not recognized (not available)
========================================================================== */
int opts_parse
(
int argc, /* number of arguments */
char *argv[] /* array of arguments */
)
{
float tmp; /* temp variable for parsing */
long mul; /* multiplication for <mbytes> arguments */
char *ep; /* error pointer of strtol function */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/*
* first set program options to default
*/
opts_reset();
/*
* skip program name
*/
argc--;
argv++;
while (argc--)
{
signed char opt; /* current option */
char *optarg; /* current option argument */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
optarg = (*argv) + 2;
/*
* read option, only "-C' is allowed where 'C' is [a-z]. pointer to
* 'C' is returned and argv is set to point to next option
*/
if ((opt = opts_get(*argv++)) == -1)
{
fprintf(stderr, "Syntax error in arguments\n");
opts_print_help();
return -1;
}
switch (opt)
{
case 'v':
printf(APP_VERSION "\n");
return 1;
case 'h':
opts_print_help();
return 1;
case 'b':
case 'r':
case 'l':
HAS_OPTARG();
tmp = (float)strtod(optarg, &ep);
mul = 1;
if (*ep)
{
switch (*ep)
{
case 'G':
mul *= 1024;
case 'M':
mul *= 1024;
case 'K':
mul *= 1024;
break;
default:
fprintf(stderr,
"parameter %s for argument '%c' is invalid\n",
optarg,
opt);
return -2;
}
}
if (opt == 'b')
{
opts.block_size = tmp * mul;
}
else if (opt == 'r')
{
opts.report_intvl = tmp * mul;
}
else
{
opts.cache_size = tmp * mul;
}
break;
case 'i':
HAS_OPTARG();
tmp = strtol(optarg, &ep, 10);
if (*ep)
{
fprintf(stderr,
"parameter %s for argument 'i' is invalid\n",
optarg);
return -2;
}
opts.num_intvl = tmp;
break;
case 'c':
HAS_OPTARG();
#if HAVE_CLOCK_GETTIME
if (strcmp(optarg, "realtime") == 0)
{
opts.clock = CLK_REALTIME;
}
else
#endif
if (strcmp(optarg, "clock") == 0)
{
opts.clock = CLK_CLOCK;
}
else
{
fprintf(stderr,
"parameter %s for optargument 'c' is invalid\n",
optarg);
return -2;
}
break;
case 'm':
HAS_OPTARG();
if (strcmp(optarg, "memcpy") == 0)
{
opts.method = METHOD_MEMCPY;
}
else if (strcmp(optarg, "bbb") == 0)
{
opts.method = METHOD_BBB;
}
else
{
fprintf(stderr,
"parameter %s for optargument 'm' is invalid\n",
optarg);
return -2;
}
break;
default:
fprintf(stderr,
"Unknown option: %c (%02x)\n",
*optarg,
(unsigned char) *optarg);
opts_print_help();
return -3;
}
}
return 0;
}
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