1 files changed, 89 insertions, 0 deletions
diff --git a/lib/xdectoint.c b/lib/xdectoint.c
new file mode 100644
index 0000000..da53018
--- /dev/null
+++ b/lib/xdectoint.c
@@ -0,0 +1,89 @@
+/* Convert decimal strings with bounds checking and exit on error.
+
+   Copyright (C) 2014-2022 Free Software Foundation, Inc.
+
+   This program 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.
+
+   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "xdectoint.h"
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "error.h"
+#include "quote.h"
+#include "verify.h"
+#include "xstrtol.h"
+
+/* Parse numeric string N_STR of base BASE, and return the value.
+   Exit on parse error or if MIN or MAX are exceeded.
+   Strings can have multiplicative SUFFIXES if specified.
+   ERR is printed along with N_STR on error.  */
+
+__xdectoint_t
+__xnumtoint (char const *n_str, int base, __xdectoint_t min, __xdectoint_t max,
+             char const *suffixes, char const *err, int err_exit)
+{
+  strtol_error s_err;
+
+  __xdectoint_t tnum;
+  s_err = __xstrtol (n_str, NULL, base, &tnum, suffixes);
+
+  if (s_err == LONGINT_OK)
+    {
+      if (tnum < min || max < tnum)
+        {
+          s_err = LONGINT_OVERFLOW;
+          /* Use have the INT range as a heuristic to distinguish
+             type overflow rather than other min/max limits.  */
+          if (tnum > INT_MAX / 2)
+            errno = EOVERFLOW;
+#if __xdectoint_signed
+          else if (tnum < INT_MIN / 2)
+            errno = EOVERFLOW;
+#endif
+          else
+            errno = ERANGE;
+        }
+    }
+  else if (s_err == LONGINT_OVERFLOW)
+    errno = EOVERFLOW;
+  else if (s_err == LONGINT_INVALID_SUFFIX_CHAR_WITH_OVERFLOW)
+    errno = 0; /* Don't show ERANGE errors for invalid numbers.  */
+
+  if (s_err != LONGINT_OK)
+    {
+      /* EINVAL error message is redundant in this context.  */
+      error (err_exit ? err_exit : EXIT_FAILURE, errno == EINVAL ? 0 : errno,
+             "%s: %s", err, quote (n_str));
+      assume (false);
+    }
+
+  return tnum;
+}
+
+/* Parse decimal string N_STR, and return the value.
+   Exit on parse error or if MIN or MAX are exceeded.
+   Strings can have multiplicative SUFFIXES if specified.
+   ERR is printed along with N_STR on error.  */
+
+__xdectoint_t
+__xdectoint (char const *n_str, __xdectoint_t min, __xdectoint_t max,
+             char const *suffixes, char const *err, int err_exit)
+{
+  return __xnumtoint (n_str, 10, min, max, suffixes, err, err_exit);
+}