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Fallback memmem implementation

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This commit is contained in:
Martin Griffin 2024-10-22 13:25:46 +01:00
parent 1421ed1b24
commit 111a95951c
2 changed files with 23 additions and 1 deletions
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2
tools/mgba-rom-test-hydra/Makefile
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@ -12,7 +12,7 @@ all: mgba-rom-test-hydra$(EXE)
@: @:
mgba-rom-test-hydra$(EXE): $(SRCS) mgba-rom-test-hydra$(EXE): $(SRCS)
$(CC) $(SRCS) -o $@ -lm $(LDFLAGS) $(CC) $(SRCS) -Werror=implicit-function-declaration -o $@ -lm $(LDFLAGS)
clean: clean:
$(RM) mgba-rom-test-hydra$(EXE) $(RM) mgba-rom-test-hydra$(EXE)

22
tools/mgba-rom-test-hydra/main.c
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@ -106,6 +106,28 @@ static const struct Symbol *lookup_address(uint32_t address)
return NULL; return NULL;
} }
#ifndef _GNU_SOURCE
// Very naive implementation of 'memmem' for systems which don't make it
// available by default.
void *memmem(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen)
{
const char *haystack_ = haystack;
const char *needle_ = needle;
for (size_t i = 0; i < haystacklen - needlelen; i++)
{
size_t j;
for (j = 0; j < needlelen; j++)
{
if (haystack_[i+j] != needle_[j])
break;
}
if (j == needlelen)
return (void *)&haystack_[i];
}
return NULL;
}
#endif
// Similar to 'fwrite(buffer, 1, size, f)' except that anything which // Similar to 'fwrite(buffer, 1, size, f)' except that anything which
// looks like the output of '%p' (i.e. '<0x\d{7}>') is translated into // looks like the output of '%p' (i.e. '<0x\d{7}>') is translated into
// the name of a symbol (if it represents one). // the name of a symbol (if it represents one).