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| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2025-04-28 14:40:03 +0200 |
|---|---|---|
| committer | Thomas Weißschuh <linux@weissschuh.net> | 2025-05-21 15:32:01 +0200 |
| commit | 7a7cd445d9275be8e4650d390156595685c3ac03 (patch) | |
| tree | dada5c5b2ecd6b52efdd70f6ea6cc492d11b974d /tools/include | |
| parent | tools/nolibc: add strstr() (diff) | |
| download | linux-7a7cd445d9275be8e4650d390156595685c3ac03.tar.gz linux-7a7cd445d9275be8e4650d390156595685c3ac03.zip | |
tools/nolibc: add %m printf format
The %m format can be used to format the current errno.
It is non-standard but supported by other commonly used libcs like glibc and
musl, so applications do rely on them.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-2-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/nolibc/stdio.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h index 8fa98abab212..df5717d59182 100644 --- a/tools/include/nolibc/stdio.h +++ b/tools/include/nolibc/stdio.h @@ -20,6 +20,8 @@ #include "string.h" #include "compiler.h" +static const char *strerror(int errnum); + #ifndef EOF #define EOF (-1) #endif @@ -292,6 +294,11 @@ int __nolibc_printf(__nolibc_printf_cb cb, intptr_t state, size_t n, const char if (!outstr) outstr="(null)"; } +#ifndef NOLIBC_IGNORE_ERRNO + else if (c == 'm') { + outstr = strerror(errno); + } +#endif /* NOLIBC_IGNORE_ERRNO */ else if (c == '%') { /* queue it verbatim */ continue; |