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#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "io.h"
static const unsigned int FLAG_DATA_FORMAT = (1 << 0);
static const unsigned int FLAG_DATA_ACCESS = (1 << 1);
static char randfile[] = "/dev/urandom";
static struct settings settings = {0};
static struct stream file_in = {.prev_idx = -1, .fd = -1};
static struct stream file_out = {.prev_idx = -1, .fd = -1, .out = 1};
static int parseargs(int argc, char **argv, struct settings * settings);
void printhelp(const char * const name);
int main(int argc, char **argv)
{
int ret = 0;
if ((ret = parseargs(argc, argv, &settings))) {
goto out;
}
if (settings.opmode == mode_generate) {
file_in.name = randfile;
file_in.out = -1;
file_in.n = settings.to;
file_out.n = settings.to;
} else {
file_in.name = settings.filein;
}
file_out.name = settings.fileout ? settings.fileout : settings.filein;
if ((ret = stream_open(&file_in, &settings)) ||
(ret = stream_open(&file_out, &settings))) {
goto out;
}
out:
stream_close(&file_in);
stream_close(&file_out);
return ret;
}
static int parseargs(int argc, char **argv, struct settings * settings)
{
struct settings s = {0};
ssize_t i;
int ret = 0;
if (argc < 2) {
goto err;
}
for (i = 1; i < argc - 1; ++i) {
if (!(strcmp(argv[i], "--sort"))) {
s.opmode = mode_normal;
} else if (!(strcmp(argv[i], "--fetch"))) {
s.opmode = mode_fetch;
} else if (!(strcmp(argv[i], "--generate"))) {
s.opmode = mode_generate;
} else if (!(strcmp(argv[i], "--array"))) {
s.opmode &= ~FLAG_DATA_FORMAT;
} else if (!(strcmp(argv[i], "--list"))) {
s.opmode |= FLAG_DATA_FORMAT;
} else if (!(strcmp(argv[i], "--cache"))) {
s.opmode &= ~FLAG_DATA_ACCESS;
} else if (!(strcmp(argv[i], "--no-cache"))) {
s.opmode |= FLAG_DATA_ACCESS;
} else if (!(strncmp(argv[i], "--position=", 11))) {
if (strlen(argv[i]) > 11) {
s.ss = strtoul(argv[i] + 11, NULL, 10);
} else {
goto err;
}
} else if (!(strncmp(argv[i], "--num=", 6))) {
if (strlen(argv[i]) > 6) {
s.to = strtoul(argv[i] + 11, NULL, 10);
} else {
goto err;
}
} else if (!(strncmp(argv[i], "--out=", 6))) {
if (strlen(argv[i]) > 6) {
s.fileout = argv[i] + 6;
} else {
goto err;
}
} else {
goto err;
}
}
if (!strncmp(argv[i], "--", 2)) {
goto err;
} else {
s.filein = argv[i];
}
if (!s.fileout) {
s.fileout = s.filein;
}
if (s.opmode == mode_generate) {
/* we always generate in-memory for speed */
s.opmode &= ~FLAG_DATA_ACCESS;
} else if (s.opmode == mode_fetch) {
s.to = s.ss + s.to;
}
s.stride = s.opmode & FLAG_DATA_FORMAT ? sizeof(struct entry_l) : sizeof(struct entry);
*settings = s;
while (0) {
err:
ret = EINVAL;
printhelp(*argv);
}
return ret;
}
void printhelp(const char * const name)
{
printf( "This is a mergesort program and such\n"
"\n"
"usage:\t%s [options]\n FILE"
"\n"
"Options:\n"
" --sort sort mode (default)\n"
" --fetch do not sort, fetch element(s) instead\n"
" --generate generate an input dataset\n"
" --array use an array data format (default)\n"
" --list use a linked list data format\n"
" --[no]-cache cache data in memory (default) or process data in-place\n"
" --position=<num> fetch element from position <num>\n"
" --num=<num> <num> of elements to fetch/generate\n"
" --out=<name> write output to <name> file\n"
"\n"
"In case more than one same option is provided, the last one take precedence\n"
"\n",
name);
return;
}
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