Fix long numbers (#1458)

nvda happened to be speaking 3647 because strtoi was actually
overflowing. Better make sure to have proper ascii to number translation
before continuing.

Fixes #1385

src/libespeak-ng/numbers.c

 #include <stdlib.h>
 #include <string.h>
 #include <wctype.h>
+#include <errno.h>
+#include <limits.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>
 	// "words" of 3 digits may be preceded by another number "word" for thousands or millions
 
 	int n_digits;
-	int value;
+	long value;
 	int ix;
 	int digix;
 	unsigned char c;
 	int thousands_inc = 0;
 	int prev_thousands = 0;
 	int ordinal = 0;
-	int this_value;
+	long this_value;
 	int decimal_count;
 	int max_decimal_count;
 	int decimal_mode;
 
 	static const char str_pause[2] = { phonPAUSE_NOLINK, 0 };
 
+	char *end;
+
 	*flags = 0;
 	n_digit_lookup = 0;
 	buf_digit_lookup[0] = 0;
 
 	for (ix = 0; IsDigit09(word[ix]); ix++) ;
 	n_digits = ix;
-	value = this_value = atoi(word);
+	errno = 0;
+	this_value = strtol(word, &end, 10);
+	if (errno || end == word || this_value > INT_MAX)
+		return 0; // long number, speak as individual digits
+	value = this_value;
 
 	group_len = 3;
 	if (tr->langopts.numbers2 & NUM2_MYRIADS)

tests/language-numbers-cardinal.test

 test_phon en "t'En tw'Enti T'3:ti f'o@ti f'Ifti s'Iksti s'Ev@nti; 'eIti n'aInti" "10 20 30 40 50 60 70 80 90" "tens"
 test_phon en-GB "Tr'i:h'VndrI2d@n s'Iksti f'aIv" "365" "hundreds"
 test_phon en-US "Tr'i:h'VndrI2d s'Iksti f'aIv" "365" "hundreds"
-test_phon en "w'0nh'VndrI2d w'0n T'aUz@nd w'0n m'Ili@n w'0n b'Ili@n w'0n tr'Ili@n w'0n kw0dr'Ili@n w'0n kwInt'Ili@n w'0n sExt'Ili@n w'0n sEpt'Ili@n w'0n 0kt'Ili@n w'0n n0n'Ili@n" "100 1000 1000000 1000000000 1000000000000 1000000000000000 1000000000000000000 1000000000000000000000 1000000000000000000000000 1000000000000000000000000000 1000000000000000000000000000000" "large" # 10^2 10^3 10^6 10^9 10^12 10^15 10^18 10^21 10^24 10^27 10^30
+test_phon en "w'0nh'VndrI2d w'0n T'aUz@nd w'0n m'Ili@n w'0n b'Ili@n w'0n tr'Ili@n w'0n kw0dr'Ili@n w'0n kwInt'Ili@n w'0n sExt'Ili@n w'0n sEpt'Ili@n w'0n 0kt'Ili@n w'0n n0n'Ili@n t'En n0n'Ili@n w'0nz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@roUz'i@roU_!z'i@r" "100 1000 1000000 1000000000 1000000000000 1000000000000000 1000000000000000000 1000000000000000000000 1000000000000000000000000 1000000000000000000000000000 1000000000000000000000000000000 10000000000000000000000000000000 100000000000000000000000000000000" "large" # 10^2 10^3 10^6 10^9 10^12 10^15 10^18 10^21 10^24 10^27 10^30 10^31 10^32
 test_phon en "f'aIv s'Iksti f'o@ w'0nh'VndrI2d@n tw'Enti Tr'i: f'o@ T'aUz@nd Tr'i:h'VndrI2d@n f'Ifti s'Ev@n f'o@ti:n T'aUz@nd_! s'Iksh'VndrI2d@n 'eIti Tr'i: s'Ev@nh'VndrI2d@n f'o@ti t'u: T'aUz@nd_! Tr'i:h'VndrI2d@n f'Ifti n'aIn s'Iks m'Ili@n_! f'o@h'VndrI2d@n s'Ev@nti f'aIv T'aUz@nd_! Tr'i:h'VndrI2d@n tw'Enti; 'eIt" "5 64 123 4357 14683 742359 6475328" "mixed"
 
 echo "... lv (Latvian)" # short scale