attempt to regularize atoi mess.

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);
+}