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Date: Thu, 7 Jun 2007 01:16:31 -0400 From: Mike Frysinger <vapier@...too.org> To: linux-kernel@...r.kernel.org Subject: [patch/rfc] implement memmem() locally in kallsyms.c This patch basically copies the gnulib version of memmem() into scripts/kallsyms.c. While a useful function, it isn't in POSIX so some systems (like Darwin) choose to omit it. How do others feel ? Signed-off-by: Mike Frysinger <vapier@...too.org> --- --- a/scripts/kallsyms.c +++ b/scripts/kallsyms.c @@ -26,8 +26,6 @@ * */ -#define _GNU_SOURCE - #include <stdio.h> #include <stdlib.h> #include <string.h> @@ -56,6 +54,37 @@ int token_profit[0x10000]; unsigned char best_table[256][2]; unsigned char best_table_len[256]; +/* memmem(), while useful, is not in POSIX, so create a local version + * so we can compile on non-GNU systems (Darwin, *BSD, etc...) + */ +void *memmem(const void *haystack, size_t haystack_len, + const void *needle, size_t needle_len) +{ + const char *begin; + const char *const last_possible = + (const char *)haystack + haystack_len - needle_len; + + /* The first occurrence of the empty string is deemed to occur at + * the beginning of the string. + */ + if (needle_len == 0) + return (void *)haystack; + + /* Sanity check, otherwise the loop might search through the whole + * memory. + */ + if (haystack_len < needle_len) + return NULL; + + for (begin = (const char *)haystack; begin <= last_possible; ++begin) + if (begin[0] == ((const char *)needle)[0] && + !memcmp((const void *)&begin[1], + (const void *)((const char *)needle + 1), + needle_len - 1)) + return (void *)begin; + + return NULL; +} static void usage(void) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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