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Date: Mon, 11 Jan 2016 17:00:00 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Andy Shevchenko <andy.shevchenko@...il.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com> Cc: Tejun Heo <tj@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, Dmitry Eremin-Solenikov <dbaryshkov@...il.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, David Airlie <airlied@...ux.ie>, Andrew Morton <akpm@...ux-foundation.org>, Rasmus Villemoes <linux@...musvillemoes.dk>, Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> Subject: Re: [PATCH v1 1/8] lib/string: introduce match_string() helper On Sat, 2016-01-09 at 13:57 +0200, Andy Shevchenko wrote: > On Sat, Jan 9, 2016 at 3:12 AM, Sergey Senozhatsky > <sergey.senozhatsky@...il.com> wrote: > > Andy Shevchenko wrote: > > [..] > > > > > > > > strncmp() case seems to be quite common. > > > > > > Like I answered to Rasmus, please, provide real examples. > > > > [..] > > > > int nmatch_string(array, array_size, string, string_len) > > > > { > > > > do { > > > > strncmp(); > > > > } while (); > > > > } > > > > > > > > int match_string(array, array_size, string) > > > > { > > > > return nmatch_string(array, array_size, string, > > > > strlen(string)); > > > > } > > > > > > See above. > > > > after some quick and inaccurate grepping, well, probably you're > > right - not worth it. > > Good grep anyway, it clearly shows that there is hard to generalize > which limit to use: a) length of a first argument / item from a list, > b) length of a second argument or a constant. > > > arch/mips/bcm63xx/boards/board_bcm963xx.c void __init > > board_prom_init(void) > > net/irda/irnet/irnet_irda.c irnet_dname_to_daddr() > > arch/powerpc/sysdev/ppc4xx_cpm.c static ssize_t cpm_idle_store() > > arch/x86/ras/mce_amd_inj.c static int __set_inj > > drivers/hwtracing/intel_th/msu.c mode_store > > drivers/pci/pcie/aer/ecrc.c void pcie_ecrc_get_policy > > drivers/pci/pcie/aspm.c pcie_aspm_set_policy > > drivers/scsi/aic7xxx/aic7xxx_osm.c aic7xxx_setup > > drivers/scsi/aic7xxx/aic79xx_osm.c aic79xx_setup > > drivers/scsi/scsi_transport_fc.c static int get_fc_##title##_match > > drivers/staging/android/ion/hisilicon/hi6220_ion.c get_type_by_name > > drivers/staging/lustre/lustre/lmv/lproc_lmv.c placement_name2policy > > drivers/xen/sys-hypervisor.c pmu_mode_store Thought more about those cases. If you would like you may introduce something like int nmatch_string(array, array_size, string, int len) { if (len < 0) return match_string(); for (…) { size_t itemlen = (len > 0) ? len : strlen(array[index]); … if (!strncmp(array[index], string, itemlen)) return index; } return -EINVAL; } And convert existing users where it makes sense. -- Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Intel Finland Oy
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