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Merge pull request #123 from andrewchambers/stdlibfd

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Add file/{fdopen,fileno} functions.
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Calvin Rose 2019-06-07 19:31:41 -04:00 committed by GitHub
commit bfc00b67bd
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1 changed files with 50 additions and 0 deletions
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src/core/io.c
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@ -164,6 +164,36 @@ static Janet cfun_io_fopen(int32_t argc, Janet *argv) {
return f ? makef(f, flags) : janet_wrap_nil();
}
static Janet cfun_io_fdopen(int32_t argc, Janet *argv) {
janet_arity(argc, 1, 2);
const int fd = janet_getinteger(argv, 0);
const uint8_t *fmode;
int flags;
if (argc == 2) {
fmode = janet_getkeyword(argv, 1);
flags = checkflags(fmode);
} else {
fmode = (const uint8_t *)"r";
flags = IO_READ;
}
#ifdef JANET_WINDOWS
#define fdopen _fdopen
#endif
FILE *f = fdopen(fd, (const char *)fmode);
return f ? makef(f, flags) : janet_wrap_nil();
}
static Janet cfun_io_fileno(int32_t argc, Janet *argv) {
janet_fixarity(argc, 1);
IOFile *iof = janet_getabstract(argv, 0, &cfun_io_filetype);
if (iof->flags & IO_CLOSED)
janet_panic("file is closed");
#ifdef JANET_WINDOWS
#define fileno _fileno
#endif
return janet_wrap_integer(fileno(iof->file));
}
/* Read up to n bytes into buffer. */
static void read_chunk(IOFile *iof, JanetBuffer *buffer, int32_t nBytesMax) {
if (!(iof->flags & (IO_READ | IO_UPDATE)))
@ -390,6 +420,26 @@ static const JanetReg io_cfuns[] = {
"\tb - open the file in binary mode (rather than text mode)\n"
"\t+ - append to the file instead of overwriting it")
},
{
"file/fdopen", cfun_io_fdopen,
JDOC("(file/fdopen fd [,mode])\n\n"
"Create a file from an fd. fd is a platform specific file descriptor, and "
"mode is a set of flags indicating the mode to open the file in. "
"mode is a keyword where each character represents a flag. If the file "
"cannot be opened, returns nil, otherwise returns the new file handle. "
"Mode flags:\n\n"
"\tr - allow reading from the file\n"
"\tw - allow writing to the file\n"
"\ta - append to the file\n"
"\tb - open the file in binary mode (rather than text mode)\n"
"\t+ - append to the file instead of overwriting it")
},
{
"file/fileno", cfun_io_fileno,
JDOC("(file/fileno f)\n\n"
"Return the underlying file descriptor for the file as a number."
"The meaning of this number is platform specific.")
},
{
"file/close", cfun_io_fclose,
JDOC("(file/close f)\n\n"