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authorDenis Vlasenko2006-10-08 12:49:22 +0000
committerDenis Vlasenko2006-10-08 12:49:22 +0000
commit1385899416a4396385ad421ae1f532be7103738a (patch)
treefc4d14a910593d1235318bb36abe5e9f72d2039e /libbb/xatol.c
parent5625415085e68ac5e150f54e685417c866620d76 (diff)
downloadbusybox-1385899416a4396385ad421ae1f532be7103738a.zip
busybox-1385899416a4396385ad421ae1f532be7103738a.tar.gz
attempt to regularize atoi mess.
Diffstat (limited to 'libbb/xatol.c')
-rw-r--r--libbb/xatol.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/libbb/xatol.c b/libbb/xatol.c
new file mode 100644
index 0000000..82250a7
--- /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);
+}