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author | Michael Brown <mcb30@ipxe.org> | 2023-05-22 13:35:34 +0100 |
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committer | Michael Brown <mcb30@ipxe.org> | 2023-05-22 15:10:16 +0100 |
commit | ce2200d5fb3d337c7fc7e8ff337c2ddf7645ba89 (patch) | |
tree | 500327d40c308f8259f98ad6968f6d92a4571420 /src/interface | |
parent | c4a8d90387437425faec91bdee42a254944bab76 (diff) | |
download | ipxe-ce2200d5fb3d337c7fc7e8ff337c2ddf7645ba89.zip ipxe-ce2200d5fb3d337c7fc7e8ff337c2ddf7645ba89.tar.gz ipxe-ce2200d5fb3d337c7fc7e8ff337c2ddf7645ba89.tar.bz2 |
[efi] Add efi_asprintf() and efi_vasprintf()
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/interface')
-rw-r--r-- | src/interface/efi/efi_strings.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/interface/efi/efi_strings.c b/src/interface/efi/efi_strings.c index aa3afc6..765b23c 100644 --- a/src/interface/efi/efi_strings.c +++ b/src/interface/efi/efi_strings.c @@ -25,6 +25,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <stddef.h> #include <stdarg.h> +#include <stdlib.h> +#include <errno.h> #include <ipxe/vsprintf.h> #include <ipxe/efi/efi_strings.h> @@ -150,3 +152,45 @@ int efi_ssnprintf ( wchar_t *wbuf, ssize_t swsize, const char *fmt, ... ) { va_end ( args ); return len; } + +/** + * Write a formatted string to newly allocated memory + * + * @v wstrp Pointer to hold allocated string + * @v fmt Format string + * @v args Arguments corresponding to the format string + * @ret len Length of formatted string (in wide characters) + */ +int efi_vasprintf ( wchar_t **wstrp, const char *fmt, va_list args ) { + size_t len; + va_list args_tmp; + + /* Calculate length needed for string */ + va_copy ( args_tmp, args ); + len = ( efi_vsnprintf ( NULL, 0, fmt, args_tmp ) + 1 ); + va_end ( args_tmp ); + + /* Allocate and fill string */ + *wstrp = malloc ( len * sizeof ( **wstrp ) ); + if ( ! *wstrp ) + return -ENOMEM; + return efi_vsnprintf ( *wstrp, len, fmt, args ); +} + +/** + * Write a formatted string to newly allocated memory + * + * @v wstrp Pointer to hold allocated string + * @v fmt Format string + * @v ... Arguments corresponding to the format string + * @ret len Length of formatted string (in wide characters) + */ +int efi_asprintf ( wchar_t **wstrp, const char *fmt, ... ) { + va_list args; + int len; + + va_start ( args, fmt ); + len = efi_vasprintf ( wstrp, fmt, args ); + va_end ( args ); + return len; +} |