Split up file reading from 'parse-xml.c' into 'file.c'

[ext/subsurface.git] / file.c

diff --git a/file.c b/file.c
new file mode 100644 (file)
index 0000000..5db36a8
--- /dev/null
+++ b/file.c
@@ -0,0 +1,73 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "dive.h"
+
+struct memblock {
+       void *buffer;
+       size_t size;
+};
+
+static int readfile(const char *filename, struct memblock *mem)
+{
+       int ret, fd = open(filename, O_RDONLY);
+       struct stat st;
+
+       mem->buffer = NULL;
+       mem->size = 0;
+
+       fd = open(filename, O_RDONLY);
+       if (fd < 0)
+               return fd;
+       ret = fstat(fd, &st);
+       if (ret < 0)
+               goto out;
+       ret = -EINVAL;
+       if (!S_ISREG(st.st_mode))
+               goto out;
+       ret = 0;
+       if (!st.st_size)
+               goto out;
+       mem->buffer = malloc(st.st_size);
+       ret = -1;
+       errno = ENOMEM;
+       if (!mem->buffer)
+               goto out;
+       mem->size = st.st_size;
+       ret = read(fd, mem->buffer, mem->size);
+       if (ret < 0)
+               goto free;
+       if (ret == mem->size)
+               goto out;
+       errno = EIO;
+       ret = -1;
+free:
+       free(mem->buffer);
+       mem->buffer = NULL;
+       mem->size = 0;
+out:
+       close(fd);
+       return ret;
+}
+
+void parse_file(const char *filename, GError **error)
+{
+       struct memblock mem;
+
+       if (readfile(filename, &mem) < 0) {
+               fprintf(stderr, "Failed to read '%s'.\n", filename);
+               if (error) {
+                       *error = g_error_new(g_quark_from_string("subsurface"),
+                                            DIVE_ERROR_PARSE,
+                                            "Failed to read '%s'",
+                                            filename);
+               }
+               return;
+       }
+
+       parse_xml_buffer(filename, mem.buffer, mem.size, error);
+       free(mem.buffer);
+}