Non-decimal radices/Convert: Difference between revisions

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 <lang c>#include <stdlib.h>
 #include <string.h>
+#include <assert.h>
 #define MAX_OUTSTR_LEN 65
@@ Line 260: / Line 261: @@
 long from_base(const char *num_str, int base)
 {
+  char *endptr;
-  return strtol(num_str, NULL, base);
+  int result = strtol(num_str, &endptr, base);
-  // there is also strtoul() for parsing into an unsigned long
+  assert(*endptr == '\0'); /* if there are any characters left, then string contained invalid characters */
-  // in C99, there is also strtoll() and strtoull() for parsing into long long and unsigned long long, respectively
+  return result;
+  /* there is also strtoul() for parsing into an unsigned long */
+  /* in C99, there is also strtoll() and strtoull() for parsing into long long and unsigned long long, respectively */
 }</lang>