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-rw-r--r--libmailutils/permstr.c128
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diff --git a/libmailutils/permstr.c b/libmailutils/permstr.c
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+++ b/libmailutils/permstr.c
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+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 2008, 2010 Free Software Foundation, Inc.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General
+ Public License along with this library; if not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301 USA */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <mailutils/stream.h>
+#include <mailutils/mutil.h>
+#include <mailutils/errno.h>
+
+#define FILE_PERM_READ 0x1
+#define FILE_PERM_WRITE 0x2
+
+static int
+parse_perm_bits (int *pmode, const char *str, const char **endp)
+{
+ switch (*str)
+ {
+ case '+':
+ case '=':
+ str++;
+ break;
+
+ default:
+ if (endp)
+ *endp = str;
+ return 1;
+ }
+
+ for (; *str; str++)
+ {
+ switch (*str)
+ {
+ case 'r':
+ *pmode |= FILE_PERM_READ;
+ break;
+
+ case 'w':
+ *pmode |= FILE_PERM_WRITE;
+ break;
+
+ case ',':
+ if (endp)
+ *endp = str;
+ return 0;
+
+ default:
+ if (endp)
+ *endp = str;
+ return 1;
+ }
+ }
+ if (endp)
+ *endp = str;
+ return 0;
+}
+
+/* Parse a MU stream permission specification in form:
+
+ g(+|=)[wr]+,o(+|=)[wr]+
+
+ Return 0 on success.
+ On failure, return MU_ERR_FAILURE and point endp to the offending character.
+*/
+int
+mu_parse_stream_perm_string (int *pmode, const char *str, const char **endp)
+{
+ int mode = 0;
+ int f;
+ while (*str)
+ {
+ switch (*str)
+ {
+ case 'g':
+ if (parse_perm_bits (&f, str + 1, &str))
+ {
+ if (endp)
+ *endp = str;
+ return MU_ERR_FAILURE;
+ }
+ if (f & FILE_PERM_READ)
+ mode |= MU_STREAM_IRGRP;
+ if (f & FILE_PERM_WRITE)
+ mode |= MU_STREAM_IWGRP;
+ break;
+
+ case 'o':
+ if (parse_perm_bits (&f, str + 1, &str))
+ {
+ if (endp)
+ *endp = str;
+ return MU_ERR_FAILURE;
+ }
+ if (f & FILE_PERM_READ)
+ mode |= MU_STREAM_IROTH;
+ if (f & FILE_PERM_WRITE)
+ mode |= MU_STREAM_IWOTH;
+ break;
+
+ default:
+ if (endp)
+ *endp = str;
+ return MU_ERR_FAILURE;
+ }
+ if (*str == ',')
+ str++;
+ }
+ *pmode = mode;
+ if (endp)
+ *endp = str;
+ return 0;
+}
+

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