$ cat dumpregex.c
#define _GNU_SOURCE
#include <dlfcn.h>
#include <locale.h>
#include <regex.h>
#include <stdio.h>
int regcomp(regex_t * restrict preg, const char * restrict regex, int cflags)
{
fprintf(stderr, "LC_ALL=%s\n", setlocale(LC_ALL, NULL));
fprintf(stderr, "LC_ADDRESS=%s\n", setlocale(LC_ADDRESS, NULL));
fprintf(stderr, "LC_COLLATE=%s\n", setlocale(LC_COLLATE, NULL));
fprintf(stderr, "LC_CTYPE=%s\n", setlocale(LC_CTYPE, NULL));
fprintf(stderr, "LC_IDENTIFICATION=%s\n", setlocale(LC_IDENTIFICATION,
NULL));
fprintf(stderr, "LC_MEASUREMENT=%s\n", setlocale(LC_MEASUREMENT, NULL));
fprintf(stderr, "LC_MESSAGES=%s\n", setlocale(LC_MESSAGES, NULL));
fprintf(stderr, "LC_MONETARY=%s\n", setlocale(LC_MONETARY, NULL));
fprintf(stderr, "LC_NAME=%s\n", setlocale(LC_NAME, NULL));
fprintf(stderr, "LC_NUMERIC=%s\n", setlocale(LC_NUMERIC, NULL));
fprintf(stderr, "LC_PAPER=%s\n", setlocale(LC_PAPER, NULL));
fprintf(stderr, "LC_TELEPHONE=%s\n", setlocale(LC_TELEPHONE, NULL));
fprintf(stderr, "LC_TIME=%s\n", setlocale(LC_TIME, NULL));
fprintf(stderr, "regcomp(%p, '%s', %d %s %s %s %s)=", preg, regex,
cflags, (cflags & REG_EXTENDED) ? "REG_EXTENDED" : "",
(cflags & REG_ICASE) ? "REG_ICASE" : "", (cflags & REG_NEWLINE)
? "REG_NEWLINE" : "", (cflags & REG_NOSUB) ? "REG_NOSUB" : "");
int ret = ((int (*)(regex_t * restrict preg, const char * restrict
regex, int cflags))dlsym(RTLD_NEXT, __func__))(preg, regex, cflags);
fprintf(stderr, "%d\n", ret);
return ret;
}
$ cc dumpregex.c -ldl -shared -odumpregex.so
$ LD_PRELOAD=./dumpregex.so git grep '[а-я]'
and indeed
$ ltrace -esetlocale -e newlocale git grep '[а-я]'
git->setlocale(LC_CTYPE, "")
= "en_GB.UTF-8"
git->setlocale(LC_MESSAGES, "")
= "en_GB.UTF-8"
git->setlocale(LC_TIME, "")
= "en_GB.UTF-8"
fatal: command line, '[а-я]': Invalid collation character
+++ exited (status 128) +++Why on earth would you do this or want that? Best, наб
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