1 files changed, 210 insertions, 0 deletions

diff --git a/libbb/xatol.c b/libbb/xatol.c
new file mode 100644
index 000000000..82250a7bb
--- /dev/null
+++ b/libbb/xatol.c
@@ -0,0 +1,210 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * ascii-to-numbers implementations for busybox
+ *
+ * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+unsigned long long xatoull(const char *numstr)
+{
+        unsigned long long r;
+        int old_errno;
+        char *e;
+        if ((*numstr == '-') || (isspace)(*numstr))
+                bb_error_msg_and_die("invalid number '%s'", numstr);
+        old_errno = errno;
+        errno = 0;
+        r = strtoull(numstr, &e, 10);
+        if (errno || (numstr == e) || *e)
+                /* Error / no digits / illegal trailing chars */
+                bb_error_msg_and_die("invalid number '%s'", numstr);
+        /* No error. So restore errno. */
+        errno = old_errno;
+        return r;
+}
+
+unsigned long xstrtoul_range_sfx(const char *numstr, int base,
+                unsigned long lower,
+                unsigned long upper,
+                const struct suffix_mult *suffixes)
+{
+        unsigned long r;
+        int old_errno;
+        char *e;
+
+        /* Disallow '-' and any leading whitespace.  Speed isn't critical here
+         * since we're parsing commandline args.  So make sure we get the
+         * actual isspace function rather than a lnumstrer macro implementaion. */
+        if ((*numstr == '-') || (isspace)(*numstr))
+                goto inval;
+
+        /* Since this is a lib function, we're not allowed to reset errno to 0.
+         * Doing so could break an app that is deferring checking of errno.
+         * So, save the old value so that we can restore it if successful. */
+        old_errno = errno;
+        errno = 0;
+        r = strtoul(numstr, &e, base);
+        /* Do the initial validity check.  Note: The standards do not
+         * guarantee that errno is set if no digits were found.  So we
+         * must test for this explicitly. */
+        if (errno || (numstr == e))
+                goto inval; /* error / no digits / illegal trailing chars */
+
+        errno = old_errno;      /* Ok.  So restore errno. */
+
+        /* Do optional suffix parsing.  Allow 'empty' suffix tables.
+         * Note that we also allow nul suffixes with associated multipliers,
+         * to allow for scaling of the numstr by some default multiplier. */
+        if (suffixes) {
+                while (suffixes->suffix) {
+                        if (strcmp(suffixes->suffix, e) == 0) {
+                                if (ULONG_MAX / suffixes->mult < r)
+                                        goto range; /* overflow! */
+                                ++e;
+                                r *= suffixes->mult;
+                                break;
+                        }
+                        ++suffixes;
+                }
+        }
+
+        /* Note: trailing space is an error.
+           It would be easy enough to allow though if desired. */
+        if (*e)
+                goto inval;
+        /* Finally, check for range limits. */
+        if (r >= lower && r <= upper)
+                return r;
+ range:
+        bb_error_msg_and_die("number %s is not in %lu..%lu range",
+                numstr, lower, upper);
+ inval:
+        bb_error_msg_and_die("invalid number '%s'", numstr);
+}
+
+unsigned long xstrtoul_range(const char *numstr, int base,
+                unsigned long lower,
+                unsigned long upper)
+{
+        return xstrtoul_range_sfx(numstr, base, lower, upper, NULL);
+}
+
+unsigned long xstrtoul(const char *numstr, int base)
+{
+        return xstrtoul_range_sfx(numstr, base, 0, ULONG_MAX, NULL);
+}
+
+unsigned long xatoul_range_sfx(const char *numstr,
+                unsigned long lower,
+                unsigned long upper,
+                const struct suffix_mult *suffixes)
+{
+        return xstrtoul_range_sfx(numstr, 10, lower, upper, suffixes);
+}
+
+unsigned long xatoul_sfx(const char *numstr,
+                const struct suffix_mult *suffixes)
+{
+        return xstrtoul_range_sfx(numstr, 10, 0, ULONG_MAX, suffixes);
+}
+
+unsigned long xatoul_range(const char *numstr,
+                unsigned long lower,
+                unsigned long upper)
+{
+        return xstrtol_range_sfx(numstr, 10, lower, upper, NULL);
+}
+
+unsigned long xatoul(const char *numstr)
+{
+        return xatoul_sfx(numstr, NULL);
+}
+
+/* Signed ones */
+
+long xstrtol_range_sfx(const char *numstr, int base,
+                long lower,
+                long upper,
+                const struct suffix_mult *suffixes)
+{
+        unsigned long u = LONG_MAX;
+        long r;
+        const char *p = numstr;
+
+        if ((p[0] == '-') && (p[1] != '+')) {
+                ++p;
+                ++u;    /* two's complement */
+        }
+
+        r = xstrtoul_range_sfx(p, base, 0, u, suffixes);
+
+        if (*numstr == '-') {
+                r = -r;
+        }
+
+        if (r < lower || r > upper) {
+                bb_error_msg_and_die("number %s is not in %ld..%ld range",
+                                numstr, lower, upper);
+        }
+
+        return r;
+}
+
+long xstrtol_range(const char *numstr, int base, long lower, long upper)
+{
+        return xstrtol_range_sfx(numstr, base, lower, upper, NULL);
+}
+
+long xatol_range_sfx(const char *numstr,
+                long lower,
+                long upper,
+                const struct suffix_mult *suffixes)
+{
+        return xstrtol_range_sfx(numstr, 10, lower, upper, suffixes);
+}
+
+long xatol_range(const char *numstr, long lower, long upper)
+{
+        return xstrtol_range_sfx(numstr, 10, lower, upper, NULL);
+}
+
+long xatol_sfx(const char *numstr, const struct suffix_mult *suffixes)
+{
+        return xstrtol_range_sfx(numstr, 10, LONG_MIN, LONG_MAX, suffixes);
+}
+
+long xatol(const char *numstr)
+{
+        return xstrtol_range_sfx(numstr, 10, LONG_MIN, LONG_MAX, NULL);
+}
+
+/* Others */
+
+unsigned xatou(const char *numstr)
+{
+        return xatoul_range(numstr, 0, UINT_MAX);
+}
+
+int xatoi(const char *numstr)
+{
+        return xatol_range(numstr, INT_MIN, INT_MAX);
+}
+
+int xatoi_u(const char *numstr)
+{
+        return xatoul_range(numstr, 0, INT_MAX);
+}
+
+uint32_t xatou32(const char *numstr)
+{
+        return xatoul_range(numstr, 0, 0xffffffff);
+}
+
+uint16_t xatou16(const char *numstr)
+{
+        return xatoul_range(numstr, 0, 0xffff);
+}