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Diffstat (limited to 'usr.bin/mandoc/dba_write.c')
-rw-r--r--usr.bin/mandoc/dba_write.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/usr.bin/mandoc/dba_write.c b/usr.bin/mandoc/dba_write.c
new file mode 100644
index 0000000..ef15dbe
--- /dev/null
+++ b/usr.bin/mandoc/dba_write.c
@@ -0,0 +1,117 @@
+/* $OpenBSD: dba_write.c,v 1.1 2016/08/01 10:32:39 schwarze Exp $ */
+/*
+ * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Low-level functions for serializing allocation-based data to disk.
+ * The interface is defined in "dba_write.h".
+ */
+#include <assert.h>
+#include <endian.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "dba_write.h"
+
+static FILE *ofp;
+
+
+int
+dba_open(const char *fname)
+{
+ ofp = fopen(fname, "w");
+ return ofp == NULL ? -1 : 0;
+}
+
+int
+dba_close(void)
+{
+ return fclose(ofp) == EOF ? -1 : 0;
+}
+
+int32_t
+dba_tell(void)
+{
+ long pos;
+
+ if ((pos = ftell(ofp)) == -1)
+ err(1, "ftell");
+ if (pos >= INT32_MAX) {
+ errno = EOVERFLOW;
+ err(1, "ftell = %ld", pos);
+ }
+ return pos;
+}
+
+void
+dba_seek(int32_t pos)
+{
+ if (fseek(ofp, pos, SEEK_SET) == -1)
+ err(1, "fseek(%d)", pos);
+}
+
+int32_t
+dba_align(void)
+{
+ int32_t pos;
+
+ pos = dba_tell();
+ while (pos & 3) {
+ dba_char_write('\0');
+ pos++;
+ }
+ return pos;
+}
+
+int32_t
+dba_skip(int32_t nmemb, int32_t sz)
+{
+ const int32_t out[5] = {0, 0, 0, 0, 0};
+ int32_t i, pos;
+
+ assert(sz >= 0);
+ assert(nmemb > 0);
+ assert(nmemb <= 5);
+ pos = dba_tell();
+ for (i = 0; i < sz; i++)
+ if (nmemb - fwrite(&out, sizeof(out[0]), nmemb, ofp))
+ err(1, "fwrite");
+ return pos;
+}
+
+void
+dba_char_write(int c)
+{
+ if (putc(c, ofp) == EOF)
+ err(1, "fputc");
+}
+
+void
+dba_str_write(const char *str)
+{
+ if (fputs(str, ofp) == EOF)
+ err(1, "fputs");
+ dba_char_write('\0');
+}
+
+void
+dba_int_write(int32_t i)
+{
+ i = htobe32(i);
+ if (fwrite(&i, sizeof(i), 1, ofp) != 1)
+ err(1, "fwrite");
+}