libbb: move nuke_str() from passwd into libbb

[oweals/busybox.git] / libbb / bb_strtonum.c

diff --git a/libbb/bb_strtonum.c b/libbb/bb_strtonum.c
index 4a0da0ae0e88e30c9e4a545251ae1a5a7c1cb7c9..949f26bee6b201a6104d596829ae006a111500e1 100644 (file)
--- a/libbb/bb_strtonum.c
+++ b/libbb/bb_strtonum.c
@@ -4,13 +4,13 @@
  *
  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"
 
 /* On exit: errno = 0 only if there was non-empty, '\0' terminated value
- * errno = EINVAL if value was not '\0' terminated, but othervise ok
+ * errno = EINVAL if value was not '\0' terminated, but otherwise ok
  *    Return value is still valid, caller should just check whether end[0]
  *    is a valid terminating char for particular case. OTOH, if caller
  *    requires '\0' terminated input, [s]he can just check errno == 0.
@@ -36,14 +36,14 @@ static unsigned long long ret_ERANGE(void)
        return ULLONG_MAX;
 }
 
-static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
+static unsigned long long handle_errors(unsigned long long v, char **endp)
 {
-       if (endp) *endp = endptr;
+       char next_ch = **endp;
 
        /* errno is already set to ERANGE by strtoXXX if value overflowed */
-       if (endptr[0]) {
+       if (next_ch) {
                /* "1234abcg" or out-of-range? */
-               if (isalnum(endptr[0]) || errno)
+               if (isalnum(next_ch) || errno)
                        return ret_ERANGE();
                /* good number, just suspicious terminator */
                errno = EINVAL;
@@ -57,30 +57,37 @@ unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
        unsigned long long v;
        char *endptr;
 
+       if (!endp) endp = &endptr;
+       *endp = (char*) arg;
+
        /* strtoul("  -4200000000") returns 94967296, errno 0 (!) */
        /* I don't think that this is right. Preventing this... */
        if (!isalnum(arg[0])) return ret_ERANGE();
 
        /* not 100% correct for lib func, but convenient for the caller */
        errno = 0;
-       v = strtoull(arg, &endptr, base);
-       return handle_errors(v, endp, endptr);
+       v = strtoull(arg, endp, base);
+       return handle_errors(v, endp);
 }
 
 long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
 {
        unsigned long long v;
        char *endptr;
+       char first;
+
+       if (!endp) endp = &endptr;
+       *endp = (char*) arg;
 
        /* Check for the weird "feature":
         * a "-" string is apparently a valid "number" for strto[u]l[l]!
         * It returns zero and errno is 0! :( */
-       char first = (arg[0] != '-' ? arg[0] : arg[1]);
+       first = (arg[0] != '-' ? arg[0] : arg[1]);
        if (!isalnum(first)) return ret_ERANGE();
 
        errno = 0;
-       v = strtoll(arg, &endptr, base);
-       return handle_errors(v, endp, endptr);
+       v = strtoll(arg, endp, base);
+       return handle_errors(v, endp);
 }
 
 #if ULONG_MAX != ULLONG_MAX
@@ -89,23 +96,30 @@ unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
        unsigned long v;
        char *endptr;
 
+       if (!endp) endp = &endptr;
+       *endp = (char*) arg;
+
        if (!isalnum(arg[0])) return ret_ERANGE();
        errno = 0;
-       v = strtoul(arg, &endptr, base);
-       return handle_errors(v, endp, endptr);
+       v = strtoul(arg, endp, base);
+       return handle_errors(v, endp);
 }
 
 long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
 {
        long v;
        char *endptr;
+       char first;
 
-       char first = (arg[0] != '-' ? arg[0] : arg[1]);
+       if (!endp) endp = &endptr;
+       *endp = (char*) arg;
+
+       first = (arg[0] != '-' ? arg[0] : arg[1]);
        if (!isalnum(first)) return ret_ERANGE();
 
        errno = 0;
-       v = strtol(arg, &endptr, base);
-       return handle_errors(v, endp, endptr);
+       v = strtol(arg, endp, base);
+       return handle_errors(v, endp);
 }
 #endif
 
@@ -115,25 +129,32 @@ unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
        unsigned long v;
        char *endptr;
 
+       if (!endp) endp = &endptr;
+       *endp = (char*) arg;
+
        if (!isalnum(arg[0])) return ret_ERANGE();
        errno = 0;
-       v = strtoul(arg, &endptr, base);
+       v = strtoul(arg, endp, base);
        if (v > UINT_MAX) return ret_ERANGE();
-       return handle_errors(v, endp, endptr);
+       return handle_errors(v, endp);
 }
 
 int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
 {
        long v;
        char *endptr;
+       char first;
+
+       if (!endp) endp = &endptr;
+       *endp = (char*) arg;
 
-       char first = (arg[0] != '-' ? arg[0] : arg[1]);
+       first = (arg[0] != '-' ? arg[0] : arg[1]);
        if (!isalnum(first)) return ret_ERANGE();
 
        errno = 0;
-       v = strtol(arg, &endptr, base);
+       v = strtol(arg, endp, base);
        if (v > INT_MAX) return ret_ERANGE();
        if (v < INT_MIN) return ret_ERANGE();
-       return handle_errors(v, endp, endptr);
+       return handle_errors(v, endp);
 }
 #endif