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powerpc: boot: add strrchr function

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libfdt gained a new dependency on strrchr, so copy the implementation
from lib/string.c. Most of the string functions are in assembly, but
stdio.c already has strnlen, so add strrchr there.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2018-03-01 08:57:40 -06:00
parent fdfb69a725
commit a54b81ea24
2 changed files with 11 additions and 0 deletions
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10
arch/powerpc/boot/stdio.c
View File

@ -21,6 +21,16 @@ size_t strnlen(const char * s, size_t count)
return sc - s;
}
char *strrchr(const char *s, int c)
{
const char *last = NULL;
do {
if (*s == (char)c)
last = s;
} while (*s++);
return (char *)last;
}
#ifdef __powerpc64__
# define do_div(n, base) ({ \

1
arch/powerpc/boot/string.h
View File

@ -7,6 +7,7 @@ extern char *strcpy(char *dest, const char *src);
extern char *strncpy(char *dest, const char *src, size_t n);
extern char *strcat(char *dest, const char *src);
extern char *strchr(const char *s, int c);
extern char *strrchr(const char *s, int c);
extern int strcmp(const char *s1, const char *s2);
extern int strncmp(const char *s1, const char *s2, size_t n);
extern size_t strlen(const char *s);