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| author | Timo Teräs <timo.teras@iki.fi> | 2020-03-04 11:27:01 +0200 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2020-03-14 21:23:37 -0400 |
| commit | 8343334d7b9cd4338bdac80e17be079cbc675ec3 (patch) | |
| tree | f5d9d39d0ae60519f92022e25620e06e26ea9560 /src/errno/__strerror.h | |
| parent | 2b2c8aafce9d80f9d58652643538f4d58e82b856 (diff) | |
| download | musl-8343334d7b9cd4338bdac80e17be079cbc675ec3.tar.gz | |
improve strerror speed
change the current O(n) lookup to O(1) based on the machinery
described in "How To Write Shared Libraries" (Appendix B).
Diffstat (limited to 'src/errno/__strerror.h')
| -rw-r--r-- | src/errno/__strerror.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/src/errno/__strerror.h b/src/errno/__strerror.h index 2f04d400..2d992da5 100644 --- a/src/errno/__strerror.h +++ b/src/errno/__strerror.h @@ -1,8 +1,9 @@ -/* This file is sorted such that 'errors' which represent exceptional - * conditions under which a correct program may fail come first, followed - * by messages that indicate an incorrect program or system failure. The - * macro E() along with double-inclusion is used to ensure that ordering - * of the strings remains synchronized. */ +/* The first entry is a catch-all for codes not enumerated here. + * This file is included multiple times to declare and define a structure + * with these messages, and then to define a lookup table translating + * error codes to offsets of corresponding fields in the structure. */ + +E(0, "No error information") E(EILSEQ, "Illegal byte sequence") E(EDOM, "Domain error") @@ -101,5 +102,3 @@ E(EDQUOT, "Quota exceeded") E(ENOMEDIUM, "No medium found") E(EMEDIUMTYPE, "Wrong medium type") E(EMULTIHOP, "Multihop attempted") - -E(0, "No error information") |