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double-merge.c
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double-merge.c
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/* This file is part of the Theseus distribution.
* Copyright 2020 Joshua E. Hill <[email protected]>
*
* Licensed under the 3-clause BSD license. For details, see the LICENSE file.
*
* Author(s)
* Joshua E. Hill, UL VS LLC.
* Joshua E. Hill, KeyPair Consulting, Inc. <[email protected]>
*/
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdnoreturn.h>
#include <sysexits.h>
#include <unistd.h>
#include "binio.h"
#include "globals-inst.h"
#include "precision.h"
/*Takes doubles from stdin (1 per line) and gives the pth percentile*/
noreturn static void useageExit(void) {
fprintf(stderr, "Usage:\n");
fprintf(stderr, "double-merge <file1> <file2> <outfile>\n");
fprintf(stderr, "Merges two sorted lists into a single merged list.\n");
exit(EX_USAGE);
}
static bool verifySorted(double *data, size_t datalen) {
double last;
bool result = true;
assert(datalen >= 1);
assert(data != NULL);
last = *data;
data++;
for (size_t i = 1; i < datalen; i++) {
if (*data < last) {
result = false;
break;
}
last = *data;
data++;
}
return result;
}
int main(int argc, char *argv[]) {
size_t datalen1, datalen2;
double *data1, *data2, *outData;
FILE *fp;
configVerbose = 0;
data1 = NULL;
data2 = NULL;
if (argc != 4) {
useageExit();
}
if ((fp = fopen(argv[1], "rb")) == NULL) {
perror("Can't open file1 for reading");
exit(EX_OSERR);
}
fprintf(stderr, "Reading data set 1.\n");
datalen1 = readdoublefile(fp, &data1);
fclose(fp);
if ((fp = fopen(argv[2], "rb")) == NULL) {
perror("Can't open file2 for reading");
exit(EX_OSERR);
}
fprintf(stderr, "Reading data set 2.\n");
datalen2 = readdoublefile(fp, &data2);
fclose(fp);
outData = malloc(sizeof(double) * (datalen1 + datalen2));
assert(outData);
// Merge the data
fprintf(stderr, "Merging the data.\n");
mergeSortedLists(data1, datalen1, data2, datalen2, outData);
assert(verifySorted(outData, datalen1 + datalen2));
if ((fp = fopen(argv[3], "wb")) == NULL) {
perror("Can't open output file for writing");
exit(EX_OSERR);
}
fprintf(stderr, "Writing the data.\n");
fwrite(outData, sizeof(double), datalen1 + datalen2, fp);
fclose(fp);
free(outData);
free(data1);
free(data2);
return (EX_OK);
}