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Marek Mahut <mmahut@fedoraproject.org>: this patch add more interactive support
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diff -Naur ./accrete-1.0-original/display.c ./accrete-1.0/display.c
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--- ./accrete-1.0-original/display.c	2007-11-24 22:37:57.000000000 +0100
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+++ ./accrete-1.0/display.c	2007-11-25 15:03:44.000000000 +0100
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@@ -1,13 +1,13 @@
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 #include "structs.h"
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 void 
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-display_system (void)
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+display_system (char *filename)
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 {
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      planet_pointer node1; 
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      int counter; 
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      FILE *f;
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-     f = fopen("New.System", "w");
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+     f = fopen(filename, "w");
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      fprintf(f,"                         SYSTEM  CHARACTERISTICS\n");
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      fprintf(f,"Mass of central star:          %6.3f solar masses\n", stellar_mass_ratio);
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@@ -105,5 +105,6 @@
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 	  counter++;
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 	  node1 = node1->next_planet;
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      }
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+	printf("\nResult saved in %s.\n", filename);
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         fclose(f);
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 }
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diff -Naur ./accrete-1.0-original/main.c ./accrete-1.0/main.c
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--- ./accrete-1.0-original/main.c	2007-11-24 22:37:57.000000000 +0100
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+++ ./accrete-1.0/main.c	2007-11-25 15:05:30.000000000 +0100
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@@ -22,6 +22,7 @@
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   init_genrand(time(NULL));
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 }
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+
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 void 
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 generate_stellar_system (void)
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 {
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@@ -87,10 +88,17 @@
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 int 
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-main (void)
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+main (int argc, char **argv)
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 {
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+
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+  if (argc != 2) {
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+	printf("Usage: %s FILE\n", argv[0]);
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+	printf("Save the result of simulation of solar system planet formation in FILE.\n");
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+       exit(0);
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+   }
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+
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   init();
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   generate_stellar_system();
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-  display_system();
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+  display_system(argv[1]);
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   return 0;
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 }
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diff -Naur ./accrete-1.0-original/proto.h ./accrete-1.0/proto.h
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--- ./accrete-1.0-original/proto.h	2007-11-24 22:37:57.000000000 +0100
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+++ ./accrete-1.0/proto.h	2007-11-25 14:57:16.000000000 +0100
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@@ -17,7 +17,7 @@
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 void coalesce_planetesimals(double a, double e, double mass, double crit_mass, double stellar_luminosity_ratio, double body_inner_bound, double body_outer_bound);
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 planet_pointer distribute_planetary_masses(double stellar_mass_ratio, double stellar_luminosity_ratio, double inner_dust, double outer_dust);
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 /* display.c */
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-void display_system(void);
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+void display_system(char *filename);
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 /* enviro.c */
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 double luminosity(double mass_ratio);
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 int orbital_zone(double orbital_radius);
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@@ -48,7 +48,7 @@
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 /* main.c */
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 void init(void);
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 void generate_stellar_system(void);
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-int main(void);
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+int main(int argc, char *argv[]);
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 /* mtrng.c */
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 void init_genrand(unsigned long s);
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 void init_by_array(unsigned long init_key[], unsigned long key_length);