FReadFmt
- Macro
- August 22, 2025
Table of Contents
FReadFmt
FReadFmtDescription
Read formatted data from a file stream. This is a macro wrapper around FReadFmtInternal.
Parameters
| Name | Direction | Description |
|---|---|---|
stream | in | Pointer to the FILE stream to read from. |
fmtstr | in | Format string to be used for reading. This must exactly describe the expected input format in the stream. argument should be a modifiable l-value wrapped with &variable. |
Success
Attempts to match fmtstr with the stream of characters in stream and reads values into the provided arguments wrapped with ``.
Failure
Failure occurs within FReadFmtInternal. Refer to its documentation for details on failure behavior (logs error message and returns, may rollback read data, or abort in unexpected situations).
Usage example (Cross-references)
- In
Io.h:488:
/// TAGS: Macro, Convenience, Stdin, I/O
///
#define ReadFmt(...) FReadFmt(stdin, __VA_ARGS__)
// not for direct use
- In
ElfInfo.c:346:
ElfHeader64 eh = {0};
FReadFmt(elf, FMT_ELF_META, eh.meta.class, eh.meta.encoding, eh.meta.version, eh.meta.os_abi, eh.meta.abi_version);
// technically padding here but we can skip it
- In
ElfInfo.c:358:
}
FReadFmt(
elf,
eh.meta.encoding == ELF_ENCODING_LSB ? FMT_ELF_HEADER_64_LE : FMT_ELF_HEADER_64_BE,