Added task 3 to task 2 executable

1 files changed, 0 insertions, 139 deletions

diff --git a/main_2.c b/main_2.c
deleted file mode 100644
index 154afe5..0000000
--- a/main_2.c
+++ /dev/null
@@ -1,139 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-
-#ifdef PIPE_GNUPLOT
-	#include <unistd.h>
-	#include <fcntl.h>
-#endif // PIPE_GNUPLOT
-
-#ifdef DYNAMIC_LOAD
-	#include <dlfcn.h>
-	void* handle = NULL;
-#endif // DYNAMIC_LOAD
-
-struct dval { double x, y; };
-
-typedef double (*func_t)(double);
-
-double sin2(double x) {
-	double y = sin(x);
-	return y*y;
-}
-
-double cos2(double x) {
-	double y = cos(x);
-	return y*y;
-}
-
-double __sincos(double x) {
-	// sin(x)cos(x) = sin(2x)/2
-	return sin(2*x)/2;
-}
-
-/// generates the table as asked in the task.
-/// The core function of this file.
-struct dval* get_table(func_t f, double start, double end, double step, long *length) {
-	long tlength = lround((end-start)/step);
-	struct dval* vals = calloc(tlength, sizeof(struct dval));
-	for (long i = 0; i < tlength; ++i) {
-		double x = start + step * i;
-		// Not accumulative because if step is too small, 
-		// start will never increment
-		vals[i] = (struct dval){.x = x, .y = f(x)};
-	}
-	*length = tlength;
-	return vals;
-}
-
-void print_help(int status) {
-	const char *help = 
-		"Usage: ./task2 -f func_name -o output_file [-h]\n"
-		"\t-h: this help\n"
-		"\t-f: function: either 'sin2', 'cos2' or 'sincos'.\n"
-		"\t\tif compiled with -DDYNAMIC_LOAD, file name with dynamic function.\n"
-		"\t-o: output file.\n\n"
-		"NOTE: the function in dynamic library must be named 'f'.\n"
-		"NOTE 2: with flag -DPIPE_GNUPLOT output will be piped in gnuplot\n.";
-	puts(help);
-	exit(status);
-}
-
-/// Get the function based on the command line flags - either use 
-/// existing or load one from dynamic library
-func_t get_function(const char* name) {
-	if (!strcmp(name, "cos2"))
-		return &cos2;
-	if (!strcmp(name, "sin2"))
-		return &sin2;
-	if (!strcmp(name, "sincos"))
-		return &__sincos;
-#ifndef DYNAMIC_LOAD
-	fputs("ERROR: unknown function. To use dynamic loading, compile with `-DDYNAMIC_LOAD`.\n", stderr);
-	exit(EXIT_FAILURE);
-#else  // DYNAMIC_LOAD
-	handle = dlopen(name, RTLD_NOW);
-	if (!handle) goto fail;
-	func_t f = dlsym(handle, "f");
-	if (!f) goto fail;
-	return f;
-fail:
-	fputs(dlerror(), stderr);
-	exit(EXIT_FAILURE);
-#endif // DYNAMIC_LOAD
-}
-
-void print_table(FILE* stream, const struct dval *table, long size) {
-	for (long i = 0; i < size; ++i) {
-		fprintf(stream, "%lg %lg\n", table[i].x, table[i].y);
-	}
-}
-
-int main(int argc, char *argv[]) {
-	func_t function = NULL;
-	const char *out = NULL;
-	// casual argument loop
-	for (int i = 1; i < argc; ++i) {
-		if (!strcmp(argv[i], "-h"))
-			print_help(EXIT_SUCCESS);
-		else if (!strcmp(argv[i], "-f"))
-			function = get_function(argv[++i]);
-		else if (!strcmp(argv[i], "-o"))
-			out = argv[++i];
-		else print_help(EXIT_FAILURE);
-	}
-	if (!function || !out) print_help(EXIT_SUCCESS);
-
-	long table_len;
-	struct dval *table = get_table(function, 0, 3, 0.01, &table_len);
-
-	// print data to stdout and to file
-	print_table(stdout, table, table_len);
-	FILE *f = fopen(out, "w+");
-	if (f) print_table(f, table, table_len);
-	else perror(out);
-
-	// This section is creating a 'gnuplot' pipe 
-	// and writing data to it to be plotted
-#ifdef PIPE_GNUPLOT 
-	FILE* gp = popen("gnuplot", "w");
-	if (!gp) goto cleanup;
-	fputs("plot '-' with lines\n", gp);
-	print_table(gp, table, table_len);
-	fputs("e\n", gp);
-	fflush(gp);
-
-	getchar();
-	pclose(gp);
-#endif // PIPE_GNUPLOT
-
-cleanup:
-	fclose(f);
-	free(table);
-#ifdef DYNAMIC_LOAD
-	if (handle) dlclose(handle);
-#endif // DYNAMIC_LOAD
-	exit(EXIT_SUCCESS);
-}
-