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Merge pull request #1072 from sogaiu/ftell 

Add file/tell
This commit is contained in:
Calvin Rose 2023-02-21 07:13:00 -06:00 committed by GitHub
parent 1144c27c54 3c523d66e9
commit f27b225b34
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2 changed files with 17 additions and 0 deletions
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14
src/core/io.c
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@ -348,11 +348,24 @@ JANET_CORE_FN(cfun_io_fseek,
return argv[0];
}
JANET_CORE_FN(cfun_io_ftell,
"(file/tell f)",
"Get the current value of the file position for file `f`.") {
janet_fixarity(argc, 1);
JanetFile *iof = janet_getabstract(argv, 0, &janet_file_type);
if (iof->flags & JANET_FILE_CLOSED)
janet_panic("file is closed");
long pos = ftell(iof->file);
if (pos == -1) janet_panic("error getting position in file");
return janet_wrap_number((double)pos);
}
static JanetMethod io_file_methods[] = {
{"close", cfun_io_fclose},
{"flush", cfun_io_fflush},
{"read", cfun_io_fread},
{"seek", cfun_io_fseek},
{"tell", cfun_io_ftell},
{"write", cfun_io_fwrite},
{NULL, NULL}
};
@ -783,6 +796,7 @@ void janet_lib_io(JanetTable *env) {
JANET_CORE_REG("file/write", cfun_io_fwrite),
JANET_CORE_REG("file/flush", cfun_io_fflush),
JANET_CORE_REG("file/seek", cfun_io_fseek),
JANET_CORE_REG("file/tell", cfun_io_ftell),
JANET_REG_END
};
janet_core_cfuns_ext(env, NULL, io_cfuns);

3
test/suite0007.janet
View File

@ -294,9 +294,12 @@
(assert-error "comptime issue" (eval '(comptime (error "oops"))))
(with [f (file/temp)]
(assert (= 0 (file/tell f)) "start of file")
(file/write f "foo\n")
(assert (= 4 (file/tell f)) "after written string")
(file/flush f)
(file/seek f :set 0)
(assert (= 0 (file/tell f)) "start of file again")
(assert (= (string (file/read f :all)) "foo\n") "temp files work"))
(var counter 0)