46 lines
849 B
Text
46 lines
849 B
Text
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/*
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* cat.lex: A demonstration of YY_NEW_FILE.
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*/
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%{
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#include <stdio.h>
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char **names = NULL;
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int current = 1;
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%}
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%%
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<<EOF>> {
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current += 1;
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if(names[current] != NULL){
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yyin = fopen(names[current],"r");
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if(yyin == NULL){
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fprintf(stderr,"cat: unable to open %s\n",
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names[current]);
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yyterminate();
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}
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YY_NEW_FILE;
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} else {
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yyterminate();
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}
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}
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%%
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int main(int argc, char **argv)
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{
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if(argc < 2){
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fprintf(stderr,"Usage: cat files....\n");
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exit(1);
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}
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names = argv;
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yyin = fopen(names[current],"r");
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if(yyin == NULL){
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fprintf(stderr,"cat: unable to open %s\n",
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names[current]);
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yyterminate();
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}
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yylex();
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}
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