diff options
Diffstat (limited to 'main_2.c')
| -rw-r--r-- | main_2.c | 25 |
1 files changed, 15 insertions, 10 deletions
@@ -10,12 +10,10 @@ #ifdef DYNAMIC_LOAD #include <dlfcn.h> -void* handle = NULL; + void* handle = NULL; #endif // DYNAMIC_LOAD -struct dval { - double x, y; -}; +struct dval { double x, y; }; typedef double (*func_t)(double); @@ -34,6 +32,8 @@ double __sincos(double x) { 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)); @@ -60,6 +60,8 @@ void print_help(int status) { 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; @@ -91,6 +93,7 @@ void print_table(FILE* stream, const struct dval *table, long size) { 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); @@ -101,19 +104,21 @@ int main(int argc, char *argv[]) { 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); - fflush(f); - } + 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 exit; + if (!gp) goto cleanup; fputs("plot '-' with lines\n", gp); print_table(gp, table, table_len); fputs("e\n", gp); @@ -123,7 +128,7 @@ int main(int argc, char *argv[]) { pclose(gp); #endif // PIPE_GNUPLOT -exit: +cleanup: fclose(f); free(table); #ifdef DYNAMIC_LOAD |