This series introduces a family of generic string case conversion functions. This kind of functionality is needed in several places in the kernel. Right now, everybody seems to be implementing their own copy of this functionality.
Based on the discussion of the previous version of this series[1] and the use cases found in the kernel, it does look like having several flavours of case conversion functions is beneficial. The use cases fall into three categories: - copying a string and converting the case while specifying a maximum length to mimic strncpy() - copying a string and converting the case without specifying a length to mimic strcpy() - converting the case of a string in-place (i.e. modifying the string that was passed in) Consequently, I am proposing these new functions: char *strncpytoupper(char *dst, const char *src, size_t len); char *strncpytolower(char *dst, const char *src, size_t len); char *strcpytoupper(char *dst, const char *src); char *strcpytolower(char *dst, const char *src); char *strtoupper(char *s); char *strtolower(char *s); They all return a pointer to the terminating '\0' in the destination string (for strtoupper() and strtolower() that is "s"). Several drivers are being modified to make use of the functions above. Another driver that also makes use of this functionality will be submitted upstream shortly, which prompted this whole exercise. The changes made here have been compile-tested, but not tried out, due to lack of required hardware. Changes since v1: - expanded strtolower() into a family of functions that cover use cases when a length argument is or isn't required and that support copying the string into a new buffer or changing it in-place - changed the function semantics to return a pointer to the terminating '\0' character of the modified string - added strtoupper() functionality mirroring the above - dropped the ACPICA patch, since that code is OS independent and can't rely on a Linux library function (see [2]) - Added two new patches replacing strtoupper() implementations [1] https://lkml.org/lkml/2016/6/30/727 [2] https://lkml.org/lkml/2016/7/1/9 Markus Mayer (7): lib: string: add functions str[n]cpytolower()/str[n]cpytoupper() drm/nouveau/core: make use of new strncpytolower() function ACPI / device_sysfs: make use of new strtolower() function staging: speakup: replace spk_strlwr() with strncpytolower() iscsi-target: replace iscsi_initiatorname_tolower() with strcpytolower() drm/nouveau/fifo/gk104: make use of new strcpytoupper() function power_supply: make use of new strcpytoupper() function drivers/acpi/device_sysfs.c | 4 +- drivers/gpu/drm/nouveau/nvkm/core/firmware.c | 9 +---- drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c | 5 +-- drivers/power/power_supply_sysfs.c | 13 +++---- drivers/staging/speakup/kobjects.c | 3 +- drivers/staging/speakup/main.c | 3 +- drivers/staging/speakup/speakup.h | 1 - drivers/staging/speakup/varhandlers.c | 12 ------ drivers/target/iscsi/iscsi_target_nego.c | 17 +-------- include/linux/string.h | 48 ++++++++++++++++++++++++ lib/string.c | 40 ++++++++++++++++++++ 11 files changed, 100 insertions(+), 55 deletions(-) -- 2.7.4 _______________________________________________ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau