31 lines
514 B
Text
31 lines
514 B
Text
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%{
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#define YY_USER_INIT open_input_file()
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extern FILE *yyin;
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void open_input_file(void)
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{
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char *file_name,buffer[1024];
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yyin = NULL;
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while(yyin == NULL){
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printf("Input file: ");
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file_name = fgets(buffer,1024,stdin);
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if(file_name){
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file_name[strlen(file_name)-1] = '\0';
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yyin = fopen(file_name,"r");
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if(yyin == NULL){
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printf("Unable to open \"%s\"\n",file_name);
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}
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} else {
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printf("stdin\n");
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yyin = stdin;
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break;
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}
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}
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}
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%}
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%%
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