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| 1 | %{
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| 2 | #define YY_USER_INIT open_input_file()
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| 3 |
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| 4 | extern FILE *yyin;
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| 5 |
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| 6 | void open_input_file(void)
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| 7 | {
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| 8 | char *file_name,buffer[1024];
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| 9 |
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| 10 | yyin = NULL;
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| 11 |
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| 12 | while(yyin == NULL){
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| 13 | printf("Input file: ");
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| 14 | file_name = fgets(buffer,1024,stdin);
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| 15 | if(file_name){
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| 16 | file_name[strlen(file_name)-1] = '\0';
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| 17 | yyin = fopen(file_name,"r");
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| 18 | if(yyin == NULL){
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| 19 | printf("Unable to open \"%s\"\n",file_name);
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| 20 | }
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| 21 | } else {
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| 22 | printf("stdin\n");
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| 23 | yyin = stdin;
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| 24 | break;
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| 25 | }
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| 26 | }
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| 27 | }
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| 28 |
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| 29 | %}
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| 30 | %%
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