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-rw-r--r--lib/sh/zmapfd.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/lib/sh/zmapfd.c b/lib/sh/zmapfd.c
new file mode 100644
index 0000000..9ff50a4
--- /dev/null
+++ b/lib/sh/zmapfd.c
@@ -0,0 +1,93 @@
+/* zmapfd - read contents of file descriptor into a newly-allocated buffer */
+
+/* Copyright (C) 2006-2020 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#include <errno.h>
+
+#include "bashansi.h"
+#include "command.h"
+#include "general.h"
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#ifndef ZBUFSIZ
+# define ZBUFSIZ 4096
+#endif
+
+extern ssize_t zread PARAMS((int, char *, size_t));
+
+/* Dump contents of file descriptor FD to *OSTR. FN is the filename for
+ error messages (not used right now). */
+int
+zmapfd (fd, ostr, fn)
+ int fd;
+ char **ostr;
+ char *fn;
+{
+ ssize_t nr;
+ int rval;
+ char lbuf[ZBUFSIZ];
+ char *result;
+ size_t rsize, rind;
+
+ rval = 0;
+ result = (char *)xmalloc (rsize = ZBUFSIZ);
+ rind = 0;
+
+ while (1)
+ {
+ nr = zread (fd, lbuf, sizeof (lbuf));
+ if (nr == 0)
+ {
+ rval = rind;
+ break;
+ }
+ else if (nr < 0)
+ {
+ free (result);
+ if (ostr)
+ *ostr = (char *)NULL;
+ return -1;
+ }
+
+ RESIZE_MALLOCED_BUFFER (result, rind, nr, rsize, ZBUFSIZ);
+ memcpy (result+rind, lbuf, nr);
+ rind += nr;
+ }
+
+ RESIZE_MALLOCED_BUFFER (result, rind, 1, rsize, 128);
+ result[rind] = '\0';
+
+ if (ostr)
+ *ostr = result;
+ else
+ free (result);
+
+ return rval;
+}