summaryrefslogtreecommitdiff
path: root/missing/strtol.c
diff options
context:
space:
mode:
Diffstat (limited to 'missing/strtol.c')
-rw-r--r--missing/strtol.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/missing/strtol.c b/missing/strtol.c
new file mode 100644
index 0000000..4941f43
--- /dev/null
+++ b/missing/strtol.c
@@ -0,0 +1,84 @@
+/*
+ * strtol.c --
+ *
+ * Source code for the "strtol" library procedure.
+ *
+ * Copyright 1988 Regents of the University of California
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies. The University of California
+ * makes no representations about the suitability of this
+ * software for any purpose. It is provided "as is" without
+ * express or implied warranty.
+ */
+
+#include <ctype.h>
+
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * strtol --
+ *
+ * Convert an ASCII string into an integer.
+ *
+ * Results:
+ * The return value is the integer equivalent of string. If endPtr
+ * is non-NULL, then *endPtr is filled in with the character
+ * after the last one that was part of the integer. If string
+ * doesn't contain a valid integer value, then zero is returned
+ * and *endPtr is set to string.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+long int
+strtol(string, endPtr, base)
+ char *string; /* String of ASCII digits, possibly
+ * preceded by white space. For bases
+ * greater than 10, either lower- or
+ * upper-case digits may be used.
+ */
+ char **endPtr; /* Where to store address of terminating
+ * character, or NULL. */
+ int base; /* Base for conversion. Must be less
+ * than 37. If 0, then the base is chosen
+ * from the leading characters of string:
+ * "0x" means hex, "0" means octal, anything
+ * else means decimal.
+ */
+{
+ register char *p;
+ int result;
+
+ /*
+ * Skip any leading blanks.
+ */
+
+ p = string;
+ while (isspace(*p)) {
+ p += 1;
+ }
+
+ /*
+ * Check for a sign.
+ */
+
+ if (*p == '-') {
+ p += 1;
+ result = -(strtoul(p, endPtr, base));
+ } else {
+ if (*p == '+') {
+ p += 1;
+ }
+ result = strtoul(p, endPtr, base);
+ }
+ if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
+ *endPtr = string;
+ }
+ return result;
+}