Split tools unto parts for fixing run_tests to link req'd deps.

[ccan] / tools / grab_file.c

diff --git a/tools/grab_file.c b/tools/grab_file.c
new file mode 100644 (file)
index 0000000..283a82b
--- /dev/null
+++ b/tools/grab_file.c
@@ -0,0 +1,58 @@
+#include "tools.h"
+#include "talloc/talloc.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+static int close_no_errno(int fd)
+{
+       int ret = 0, serrno = errno;
+       if (close(fd) < 0)
+               ret = errno;
+       errno = serrno;
+       return ret;
+}
+
+void *grab_fd(const void *ctx, int fd)
+{
+       int ret;
+       unsigned int max = 16384, size = 0;
+       char *buffer;
+
+       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;
+}
+
+/* This version adds one byte (for nul term) */
+void *grab_file(const void *ctx, const char *filename)
+{
+       int fd;
+       char *buffer;
+
+       if (streq(filename, "-"))
+               fd = dup(STDIN_FILENO);
+       else
+               fd = open(filename, O_RDONLY, 0);
+
+       if (fd < 0)
+               return NULL;
+
+       buffer = grab_fd(ctx, fd);
+       close_no_errno(fd);
+       return buffer;
+}
+