Rename string to str, and split into three modules.

[ccan] / ccan / grab_file / grab_file.c

diff --git a/ccan/grab_file/grab_file.c b/ccan/grab_file/grab_file.c
new file mode 100644 (file)
index 0000000..6f2c9fe
--- /dev/null
+++ b/ccan/grab_file/grab_file.c
@@ -0,0 +1,50 @@
+#include "grab_file.h"
+#include "talloc/talloc.h"
+#include "noerr/noerr.h"
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+void *grab_fd(const void *ctx, int fd, size_t *size)
+{
+       int ret;
+       size_t max = 16384, s;
+       char *buffer;
+
+       if (!size)
+               size = &s;
+       *size = 0;
+
+       buffer = talloc_array(ctx, char, max+1);
+       while ((ret = read(fd, buffer + *size, max - *size)) > 0) {
+               *size += ret;
+               if (*size == max)
+                       buffer = talloc_realloc(ctx, buffer, char, max*=2 + 1);
+       }
+       if (ret < 0) {
+               talloc_free(buffer);
+               buffer = NULL;
+       } else
+               buffer[*size] = '\0';
+
+       return buffer;
+}
+
+void *grab_file(const void *ctx, const char *filename, size_t *size)
+{
+       int fd;
+       char *buffer;
+
+       if (!filename)
+               fd = dup(STDIN_FILENO);
+       else
+               fd = open(filename, O_RDONLY, 0);
+
+       if (fd < 0)
+               return NULL;
+
+       buffer = grab_fd(ctx, fd, size);
+       close_noerr(fd);
+       return buffer;
+}