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| author | Florian Weimer <fweimer@redhat.com> | 2022-12-19 18:56:54 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2022-12-19 18:56:54 +0100 |
| commit | 659fe9fdd14b0772f4e9722b751b9b010665e053 (patch) | |
| tree | 3098a69345fbd3474154bbba45e8f21de449f266 /stdio-common/Makefile | |
| parent | ffde06c915d10c0717a0980508ccb28506c6ec63 (diff) | |
| download | glibc-659fe9fdd14b0772f4e9722b751b9b010665e053.tar.xz glibc-659fe9fdd14b0772f4e9722b751b9b010665e053.zip | |
stdio-common: Introduce buffers for implementing printf
These buffers will eventually be used instead of FILE * objects
to implement printf functions. The multibyte buffer is struct
__printf_buffer, the wide buffer is struct __wprintf_buffer.
To enable writing type-generic code, the header files
printf_buffer-char.h and printf_buffer-wchar_t.h define the
Xprintf macro differently, enabling Xprintf (buffer) to stand
for __printf_buffer and __wprintf_buffer as appropriate. For
common cases, macros like Xprintf_buffer are provided as a more
syntactically convenient shortcut.
Buffer-specific flush callbacks are implemented with a switch
statement instead of a function pointer, to avoid hardening issues
similar to those of libio vtables. struct __printf_buffer_as_file
is needed to support custom printf specifiers because the public
interface for that requires passing a FILE *, which is why there
is a trapdoor back from these buffers to FILE * streams.
Since the immediate user of these interfaces knows when processing
has finished, there is no flush callback for the end of processing,
only a flush callback for the intermediate buffer flush.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'stdio-common/Makefile')
| -rw-r--r-- | stdio-common/Makefile | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/stdio-common/Makefile b/stdio-common/Makefile index 8f2524959d..120d66ea93 100644 --- a/stdio-common/Makefile +++ b/stdio-common/Makefile @@ -53,6 +53,14 @@ routines := \ perror \ printf \ printf-prs \ + printf_buffer_as_file \ + printf_buffer_done \ + printf_buffer_flush \ + printf_buffer_pad_1 \ + printf_buffer_putc_1 \ + printf_buffer_puts_1 \ + printf_buffer_to_file \ + printf_buffer_write \ printf_fp \ printf_fphex \ printf_size \ @@ -85,6 +93,14 @@ routines := \ vfwscanf \ vfwscanf-internal \ vprintf \ + wprintf_buffer_as_file \ + wprintf_buffer_done \ + wprintf_buffer_flush \ + wprintf_buffer_pad_1 \ + wprintf_buffer_putc_1 \ + wprintf_buffer_puts_1 \ + wprintf_buffer_to_file \ + wprintf_buffer_write \ # routines aux := \ |