diff options
author | Manoj Srivastava <srivasta@debian.org> | 2016-07-29 18:07:24 -0700 |
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committer | Manoj Srivastava <srivasta@debian.org> | 2016-07-29 18:07:24 -0700 |
commit | f1d010bed8760aa87f9c72eded97d4d9b98cc620 (patch) | |
tree | 439628ed03b3b68404b7198883f993d1ef2b6753 /examples/manual/userinit.lex |
Import flex_2.6.1.orig.tar.gz
[dgit import orig flex_2.6.1.orig.tar.gz]
Diffstat (limited to 'examples/manual/userinit.lex')
-rw-r--r-- | examples/manual/userinit.lex | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/examples/manual/userinit.lex b/examples/manual/userinit.lex new file mode 100644 index 0000000..9a56471 --- /dev/null +++ b/examples/manual/userinit.lex @@ -0,0 +1,30 @@ +%{ +#define YY_USER_INIT open_input_file() + +extern FILE *yyin; + +void open_input_file(void) +{ + char *file_name,buffer[1024]; + + yyin = NULL; + + while(yyin == NULL){ + printf("Input file: "); + file_name = fgets(buffer,1024,stdin); + if(file_name){ + file_name[strlen(file_name)-1] = '\0'; + yyin = fopen(file_name,"r"); + if(yyin == NULL){ + printf("Unable to open \"%s\"\n",file_name); + } + } else { + printf("stdin\n"); + yyin = stdin; + break; + } + } +} + +%} +%% |