[PATCH v4 07/19] libfdt: get libfdt to build

[Andrew Jones <drjones@xxxxxxxxxx>]

Add string functions needed for libfdt, and add a make target.

Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
---
v4: rewrite strchr w/out use of strlen, drop libfdt_env.h modifications
---
 Makefile       | 21 +++++++++++++++++++--
 lib/libcflat.h |  4 ++++
 lib/string.c   | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 32ae9a59db5b0..fba58e36f272f 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,13 @@ cflatobjs := \
 	lib/string.o \
 	lib/report.o
 
+# libfdt paths
+LIBFDT_objdir = lib/libfdt
+LIBFDT_srcdir = lib/libfdt
+LIBFDT_archive = $(LIBFDT_objdir)/libfdt.a
+LIBFDT_include = $(addprefix $(LIBFDT_srcdir)/,$(LIBFDT_INCLUDES))
+LIBFDT_version = $(addprefix $(LIBFDT_srcdir)/,$(LIBFDT_VERSION))
+
 #include architecure specific make rules
 include config/config-$(ARCH).mak
 
@@ -46,6 +53,11 @@ LDFLAGS += -pthread -lrt
 $(libcflat): $(cflatobjs)
 	$(AR) rcs $@ $^
 
+include $(LIBFDT_srcdir)/Makefile.libfdt
+$(LIBFDT_archive): CFLAGS += -ffreestanding -I lib -I lib/libfdt -Wno-sign-compare
+$(LIBFDT_archive): $(addprefix $(LIBFDT_objdir)/,$(LIBFDT_OBJS))
+	$(AR) rcs $@ $^
+
 %.o: %.S
 	$(CC) $(CFLAGS) -c -nostdlib -o $@ $<
 
@@ -58,10 +70,15 @@ install:
 clean: arch_clean
 	$(RM) lib/.*.d $(libcflat) $(cflatobjs)
 
-distclean: clean
+libfdt_clean:
+	$(RM) $(LIBFDT_archive) \
+	$(addprefix $(LIBFDT_objdir)/,$(LIBFDT_OBJS)) \
+	$(LIBFDT_objdir)/.*.d
+
+distclean: clean libfdt_clean
 	$(RM) config.mak $(TEST_DIR)-run test.log msr.out cscope.*
 
-cscope: common_dirs = lib
+cscope: common_dirs = lib lib/libfdt
 cscope:
 	$(RM) ./cscope.*
 	find $(TEST_DIR) lib/$(TEST_DIR) $(common_dirs) -maxdepth 1 \
diff --git a/lib/libcflat.h b/lib/libcflat.h
index 1bc7dfcac5663..76448a33cde5f 100644
--- a/lib/libcflat.h
+++ b/lib/libcflat.h
@@ -42,6 +42,7 @@ extern void exit(int code);
 extern unsigned long strlen(const char *buf);
 extern char *strcat(char *dest, const char *src);
 extern int strcmp(const char *a, const char *b);
+extern char *strchr(const char *s, int c);
 
 extern int printf(const char *fmt, ...);
 extern int snprintf(char *buf, int size, const char *fmt, ...);
@@ -51,6 +52,9 @@ extern void puts(const char *s);
 
 extern void *memset(void *s, int c, size_t n);
 extern void *memcpy(void *dest, const void *src, size_t n);
+extern int memcmp(const void *s1, const void *s2, size_t n);
+extern void *memmove(void *dest, const void *src, size_t n);
+extern void *memchr(const void *s, int c, size_t n);
 
 extern long atol(const char *ptr);
 #define ARRAY_SIZE(_a)  (sizeof(_a)/sizeof((_a)[0]))
diff --git a/lib/string.c b/lib/string.c
index 3a9caf720bf2b..fe90c8b1289f2 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -31,6 +31,14 @@ int strcmp(const char *a, const char *b)
     return *a - *b;
 }
 
+char *strchr(const char *s, int c)
+{
+    while (*s != (char)c)
+	if (*s++ == '\0')
+	    return NULL;
+    return (char *)s;
+}
+
 void *memset(void *s, int c, size_t n)
 {
     size_t i;
@@ -54,6 +62,46 @@ void *memcpy(void *dest, const void *src, size_t n)
     return dest;
 }
 
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+    const unsigned char *a = s1, *b = s2;
+    int ret = 0;
+
+    while (n--) {
+	ret = *a - *b;
+	if (ret)
+	    break;
+	++a, ++b;
+    }
+    return ret;
+}
+
+void *memmove(void *dest, const void *src, size_t n)
+{
+    const unsigned char *s = src;
+    unsigned char *d = dest;
+
+    if (d <= s) {
+	while (n--)
+	    *d++ = *s++;
+    } else {
+	d += n, s += n;
+	while (n--)
+	    *--d = *--s;
+    }
+    return dest;
+}
+
+void *memchr(const void *s, int c, size_t n)
+{
+    const unsigned char *str = s, chr = (unsigned char)c;
+
+    while (n--)
+	if (*str++ == chr)
+	    return (void *)(str - 1);
+    return NULL;
+}
+
 long atol(const char *ptr)
 {
     long acc = 0;
-- 
1.8.1.4

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