diff --git a/Makefile b/Makefile index dd90866..e7768ee 100644 --- a/Makefile +++ b/Makefile @@ -1,10 +1,10 @@ -all: libblob.a libblob.so +all: libblob.a libblob.so simple-example SOURCE:=$(wildcard *.c) HEADERS:=$(wildcard *.h) OBJECTS:=$(patsubst %.c,%.o,$(SOURCE)) LDFLAGS+=-ljson-c -CFLAGS+=-fPIC +CFLAGS+=-g -std=gnu99 -fPIC libblob.a: $(OBJECTS) $(AR) rcs -o $@ $^ @@ -15,5 +15,8 @@ libblob.so: $(OBJECTS) %.o: %.c $(CC) $(CFLAGS) -c -o $@ $^ +simple-example: examples/simple.c libblob.a + $(CC) $(CFLAGS) -I. -o $@ $^ -L. -lblob -ljson-c + clean: - rm -f *.o + rm -f *.o *.a *.so diff --git a/examples/simple.c b/examples/simple.c new file mode 100644 index 0000000..5be8dd5 --- /dev/null +++ b/examples/simple.c @@ -0,0 +1,142 @@ +#include +#include + +#include + +static const char *indent_str = "\t\t\t\t\t\t\t\t\t\t\t\t\t"; + +#define indent_printf(indent, ...) do { \ + if (indent > 0) \ + fwrite(indent_str, indent, 1, stderr); \ + fprintf(stderr, __VA_ARGS__); \ +} while(0) + +static void dump_attr_data(struct blob_attr *data, int indent, int next_indent); + +static void +dump_table(struct blob_attr *head, int len, int indent, bool array) +{ + struct blob_attr *attr; + struct blobmsg_hdr *hdr; + + indent_printf(indent, "{\n"); + __blob_buf_for_each_attr(attr, head, len) { + hdr = blob_attr_data(attr); + if (!array) + indent_printf(indent + 1, "%s : ", hdr->name); + dump_attr_data(attr, 0, indent + 1); + } + indent_printf(indent, "}\n"); +} + +static void dump_attr_data(struct blob_attr *data, int indent, int next_indent) +{ + int type = blobmsg_type(data); + switch(type) { + case BLOBMSG_TYPE_STRING: + indent_printf(indent, "%s\n", blobmsg_get_string(data)); + break; + case BLOBMSG_TYPE_INT8: + indent_printf(indent, "%d\n", blobmsg_get_u8(data)); + break; + case BLOBMSG_TYPE_INT16: + indent_printf(indent, "%d\n", blobmsg_get_u16(data)); + break; + case BLOBMSG_TYPE_INT32: + indent_printf(indent, "%d\n", blobmsg_get_u32(data)); + break; + case BLOBMSG_TYPE_INT64: + indent_printf(indent, "%"PRIu64"\n", blobmsg_get_u64(data)); + break; + case BLOBMSG_TYPE_TABLE: + case BLOBMSG_TYPE_ARRAY: + if (!indent) + indent_printf(indent, "\n"); + dump_table(blobmsg_data(data), blobmsg_data_len(data), + next_indent, type == BLOBMSG_TYPE_ARRAY); + break; + } +} + +enum { + FOO_MESSAGE, + FOO_LIST, + FOO_TESTDATA +}; + +static const struct blobmsg_policy pol[] = { + [FOO_MESSAGE] = { + .name = "message", + .type = BLOBMSG_TYPE_STRING, + }, + [FOO_LIST] = { + .name = "list", + .type = BLOBMSG_TYPE_ARRAY, + }, + [FOO_TESTDATA] = { + .name = "testdata", + .type = BLOBMSG_TYPE_TABLE, + }, +}; + +#ifndef ARRAY_SIZE +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +#endif + +static void dump_message(struct blob_buf *buf) +{ + struct blob_attr *tb[ARRAY_SIZE(pol)]; + + if (blobmsg_parse(pol, ARRAY_SIZE(pol), tb, blob_attr_data(buf->head), blob_attr_len(buf->head)) != 0) { + fprintf(stderr, "Parse failed\n"); + return; + } + if (tb[FOO_MESSAGE]) + fprintf(stderr, "Message: %s\n", (char *) blobmsg_data(tb[FOO_MESSAGE])); + + if (tb[FOO_LIST]) { + fprintf(stderr, "List: "); + dump_table(blobmsg_data(tb[FOO_LIST]), blobmsg_data_len(tb[FOO_LIST]), 0, true); + } + if (tb[FOO_TESTDATA]) { + fprintf(stderr, "Testdata: "); + dump_table(blobmsg_data(tb[FOO_TESTDATA]), blobmsg_data_len(tb[FOO_TESTDATA]), 0, false); + } +} + +static void +fill_message(struct blob_buf *buf) +{ + void *tbl; + + blobmsg_add_string(buf, "message", "Hello, world!"); + + tbl = blobmsg_open_table(buf, "testdata"); + blobmsg_add_u32(buf, "hello", 1); + blobmsg_add_string(buf, "world", "2"); + blobmsg_close_table(buf, tbl); + + tbl = blobmsg_open_array(buf, "list"); + blobmsg_add_u32(buf, NULL, 0); + blobmsg_add_u32(buf, NULL, 1); + blobmsg_add_u32(buf, NULL, 2); + blobmsg_close_table(buf, tbl); +} + +int main(int argc, char **argv) +{ + struct blob_buf buf; + + blob_buf_init(&buf); + for(int c = 0; c < 10; c++){ + blobmsg_init(&buf); + fill_message(&buf); + dump_message(&buf); + char *json = blobmsg_format_json(buf.head, true); + printf("json: %s\n", json); + free(json); + } + + blob_buf_free(&buf); + return 0; +}