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Date: Mon, 12 Jun 2023 14:30:44 +0200
From: Bruno Haible <bruno@...sp.org>
To: musl@...ts.openwall.com
Subject: swprintf cannot handle the character 0xff
When swprintf is meant to convert a character to a wide character, through
the %c directive, it fails if that character is '\xff'.
Seen with musl libc 1.2.4, in Alpine Linux 3.18.0.
How to reproduce:
============================ foo.c ============================
#include <stdio.h>
#include <wchar.h>
int main ()
{
wchar_t buf[12];
for (int c = 1; c < 256; c++)
{
fprintf (stderr, "c = %d: ", c);
int ret = swprintf (buf, 12, L"%c", c);
if (ret >= 0)
fprintf (stderr, "OK, %d bytes\n", ret);
else
perror ("swprintf failed");
}
}
===============================================================
$ gcc -Wall foo.c
$ ./a.out
Expected output:
c = 1: OK, 1 bytes
c = 2: OK, 1 bytes
c = 3: OK, 1 bytes
c = 4: OK, 1 bytes
c = 5: OK, 1 bytes
c = 6: OK, 1 bytes
c = 7: OK, 1 bytes
c = 8: OK, 1 bytes
c = 9: OK, 1 bytes
c = 10: OK, 1 bytes
c = 11: OK, 1 bytes
c = 12: OK, 1 bytes
c = 13: OK, 1 bytes
c = 14: OK, 1 bytes
c = 15: OK, 1 bytes
c = 16: OK, 1 bytes
c = 17: OK, 1 bytes
c = 18: OK, 1 bytes
c = 19: OK, 1 bytes
c = 20: OK, 1 bytes
c = 21: OK, 1 bytes
c = 22: OK, 1 bytes
c = 23: OK, 1 bytes
c = 24: OK, 1 bytes
c = 25: OK, 1 bytes
c = 26: OK, 1 bytes
c = 27: OK, 1 bytes
c = 28: OK, 1 bytes
c = 29: OK, 1 bytes
c = 30: OK, 1 bytes
c = 31: OK, 1 bytes
c = 32: OK, 1 bytes
c = 33: OK, 1 bytes
c = 34: OK, 1 bytes
c = 35: OK, 1 bytes
c = 36: OK, 1 bytes
c = 37: OK, 1 bytes
c = 38: OK, 1 bytes
c = 39: OK, 1 bytes
c = 40: OK, 1 bytes
c = 41: OK, 1 bytes
c = 42: OK, 1 bytes
c = 43: OK, 1 bytes
c = 44: OK, 1 bytes
c = 45: OK, 1 bytes
c = 46: OK, 1 bytes
c = 47: OK, 1 bytes
c = 48: OK, 1 bytes
c = 49: OK, 1 bytes
c = 50: OK, 1 bytes
c = 51: OK, 1 bytes
c = 52: OK, 1 bytes
c = 53: OK, 1 bytes
c = 54: OK, 1 bytes
c = 55: OK, 1 bytes
c = 56: OK, 1 bytes
c = 57: OK, 1 bytes
c = 58: OK, 1 bytes
c = 59: OK, 1 bytes
c = 60: OK, 1 bytes
c = 61: OK, 1 bytes
c = 62: OK, 1 bytes
c = 63: OK, 1 bytes
c = 64: OK, 1 bytes
c = 65: OK, 1 bytes
c = 66: OK, 1 bytes
c = 67: OK, 1 bytes
c = 68: OK, 1 bytes
c = 69: OK, 1 bytes
c = 70: OK, 1 bytes
c = 71: OK, 1 bytes
c = 72: OK, 1 bytes
c = 73: OK, 1 bytes
c = 74: OK, 1 bytes
c = 75: OK, 1 bytes
c = 76: OK, 1 bytes
c = 77: OK, 1 bytes
c = 78: OK, 1 bytes
c = 79: OK, 1 bytes
c = 80: OK, 1 bytes
c = 81: OK, 1 bytes
c = 82: OK, 1 bytes
c = 83: OK, 1 bytes
c = 84: OK, 1 bytes
c = 85: OK, 1 bytes
c = 86: OK, 1 bytes
c = 87: OK, 1 bytes
c = 88: OK, 1 bytes
c = 89: OK, 1 bytes
c = 90: OK, 1 bytes
c = 91: OK, 1 bytes
c = 92: OK, 1 bytes
c = 93: OK, 1 bytes
c = 94: OK, 1 bytes
c = 95: OK, 1 bytes
c = 96: OK, 1 bytes
c = 97: OK, 1 bytes
c = 98: OK, 1 bytes
c = 99: OK, 1 bytes
c = 100: OK, 1 bytes
c = 101: OK, 1 bytes
c = 102: OK, 1 bytes
c = 103: OK, 1 bytes
c = 104: OK, 1 bytes
c = 105: OK, 1 bytes
c = 106: OK, 1 bytes
c = 107: OK, 1 bytes
c = 108: OK, 1 bytes
c = 109: OK, 1 bytes
c = 110: OK, 1 bytes
c = 111: OK, 1 bytes
c = 112: OK, 1 bytes
c = 113: OK, 1 bytes
c = 114: OK, 1 bytes
c = 115: OK, 1 bytes
c = 116: OK, 1 bytes
c = 117: OK, 1 bytes
c = 118: OK, 1 bytes
c = 119: OK, 1 bytes
c = 120: OK, 1 bytes
c = 121: OK, 1 bytes
c = 122: OK, 1 bytes
c = 123: OK, 1 bytes
c = 124: OK, 1 bytes
c = 125: OK, 1 bytes
c = 126: OK, 1 bytes
c = 127: OK, 1 bytes
c = 128: OK, 1 bytes
c = 129: OK, 1 bytes
c = 130: OK, 1 bytes
c = 131: OK, 1 bytes
c = 132: OK, 1 bytes
c = 133: OK, 1 bytes
c = 134: OK, 1 bytes
c = 135: OK, 1 bytes
c = 136: OK, 1 bytes
c = 137: OK, 1 bytes
c = 138: OK, 1 bytes
c = 139: OK, 1 bytes
c = 140: OK, 1 bytes
c = 141: OK, 1 bytes
c = 142: OK, 1 bytes
c = 143: OK, 1 bytes
c = 144: OK, 1 bytes
c = 145: OK, 1 bytes
c = 146: OK, 1 bytes
c = 147: OK, 1 bytes
c = 148: OK, 1 bytes
c = 149: OK, 1 bytes
c = 150: OK, 1 bytes
c = 151: OK, 1 bytes
c = 152: OK, 1 bytes
c = 153: OK, 1 bytes
c = 154: OK, 1 bytes
c = 155: OK, 1 bytes
c = 156: OK, 1 bytes
c = 157: OK, 1 bytes
c = 158: OK, 1 bytes
c = 159: OK, 1 bytes
c = 160: OK, 1 bytes
c = 161: OK, 1 bytes
c = 162: OK, 1 bytes
c = 163: OK, 1 bytes
c = 164: OK, 1 bytes
c = 165: OK, 1 bytes
c = 166: OK, 1 bytes
c = 167: OK, 1 bytes
c = 168: OK, 1 bytes
c = 169: OK, 1 bytes
c = 170: OK, 1 bytes
c = 171: OK, 1 bytes
c = 172: OK, 1 bytes
c = 173: OK, 1 bytes
c = 174: OK, 1 bytes
c = 175: OK, 1 bytes
c = 176: OK, 1 bytes
c = 177: OK, 1 bytes
c = 178: OK, 1 bytes
c = 179: OK, 1 bytes
c = 180: OK, 1 bytes
c = 181: OK, 1 bytes
c = 182: OK, 1 bytes
c = 183: OK, 1 bytes
c = 184: OK, 1 bytes
c = 185: OK, 1 bytes
c = 186: OK, 1 bytes
c = 187: OK, 1 bytes
c = 188: OK, 1 bytes
c = 189: OK, 1 bytes
c = 190: OK, 1 bytes
c = 191: OK, 1 bytes
c = 192: OK, 1 bytes
c = 193: OK, 1 bytes
c = 194: OK, 1 bytes
c = 195: OK, 1 bytes
c = 196: OK, 1 bytes
c = 197: OK, 1 bytes
c = 198: OK, 1 bytes
c = 199: OK, 1 bytes
c = 200: OK, 1 bytes
c = 201: OK, 1 bytes
c = 202: OK, 1 bytes
c = 203: OK, 1 bytes
c = 204: OK, 1 bytes
c = 205: OK, 1 bytes
c = 206: OK, 1 bytes
c = 207: OK, 1 bytes
c = 208: OK, 1 bytes
c = 209: OK, 1 bytes
c = 210: OK, 1 bytes
c = 211: OK, 1 bytes
c = 212: OK, 1 bytes
c = 213: OK, 1 bytes
c = 214: OK, 1 bytes
c = 215: OK, 1 bytes
c = 216: OK, 1 bytes
c = 217: OK, 1 bytes
c = 218: OK, 1 bytes
c = 219: OK, 1 bytes
c = 220: OK, 1 bytes
c = 221: OK, 1 bytes
c = 222: OK, 1 bytes
c = 223: OK, 1 bytes
c = 224: OK, 1 bytes
c = 225: OK, 1 bytes
c = 226: OK, 1 bytes
c = 227: OK, 1 bytes
c = 228: OK, 1 bytes
c = 229: OK, 1 bytes
c = 230: OK, 1 bytes
c = 231: OK, 1 bytes
c = 232: OK, 1 bytes
c = 233: OK, 1 bytes
c = 234: OK, 1 bytes
c = 235: OK, 1 bytes
c = 236: OK, 1 bytes
c = 237: OK, 1 bytes
c = 238: OK, 1 bytes
c = 239: OK, 1 bytes
c = 240: OK, 1 bytes
c = 241: OK, 1 bytes
c = 242: OK, 1 bytes
c = 243: OK, 1 bytes
c = 244: OK, 1 bytes
c = 245: OK, 1 bytes
c = 246: OK, 1 bytes
c = 247: OK, 1 bytes
c = 248: OK, 1 bytes
c = 249: OK, 1 bytes
c = 250: OK, 1 bytes
c = 251: OK, 1 bytes
c = 252: OK, 1 bytes
c = 253: OK, 1 bytes
c = 254: OK, 1 bytes
c = 255: OK, 1 bytes
Actual output:
c = 1: OK, 1 bytes
c = 2: OK, 1 bytes
c = 3: OK, 1 bytes
c = 4: OK, 1 bytes
c = 5: OK, 1 bytes
c = 6: OK, 1 bytes
c = 7: OK, 1 bytes
c = 8: OK, 1 bytes
c = 9: OK, 1 bytes
c = 10: OK, 1 bytes
c = 11: OK, 1 bytes
c = 12: OK, 1 bytes
c = 13: OK, 1 bytes
c = 14: OK, 1 bytes
c = 15: OK, 1 bytes
c = 16: OK, 1 bytes
c = 17: OK, 1 bytes
c = 18: OK, 1 bytes
c = 19: OK, 1 bytes
c = 20: OK, 1 bytes
c = 21: OK, 1 bytes
c = 22: OK, 1 bytes
c = 23: OK, 1 bytes
c = 24: OK, 1 bytes
c = 25: OK, 1 bytes
c = 26: OK, 1 bytes
c = 27: OK, 1 bytes
c = 28: OK, 1 bytes
c = 29: OK, 1 bytes
c = 30: OK, 1 bytes
c = 31: OK, 1 bytes
c = 32: OK, 1 bytes
c = 33: OK, 1 bytes
c = 34: OK, 1 bytes
c = 35: OK, 1 bytes
c = 36: OK, 1 bytes
c = 37: OK, 1 bytes
c = 38: OK, 1 bytes
c = 39: OK, 1 bytes
c = 40: OK, 1 bytes
c = 41: OK, 1 bytes
c = 42: OK, 1 bytes
c = 43: OK, 1 bytes
c = 44: OK, 1 bytes
c = 45: OK, 1 bytes
c = 46: OK, 1 bytes
c = 47: OK, 1 bytes
c = 48: OK, 1 bytes
c = 49: OK, 1 bytes
c = 50: OK, 1 bytes
c = 51: OK, 1 bytes
c = 52: OK, 1 bytes
c = 53: OK, 1 bytes
c = 54: OK, 1 bytes
c = 55: OK, 1 bytes
c = 56: OK, 1 bytes
c = 57: OK, 1 bytes
c = 58: OK, 1 bytes
c = 59: OK, 1 bytes
c = 60: OK, 1 bytes
c = 61: OK, 1 bytes
c = 62: OK, 1 bytes
c = 63: OK, 1 bytes
c = 64: OK, 1 bytes
c = 65: OK, 1 bytes
c = 66: OK, 1 bytes
c = 67: OK, 1 bytes
c = 68: OK, 1 bytes
c = 69: OK, 1 bytes
c = 70: OK, 1 bytes
c = 71: OK, 1 bytes
c = 72: OK, 1 bytes
c = 73: OK, 1 bytes
c = 74: OK, 1 bytes
c = 75: OK, 1 bytes
c = 76: OK, 1 bytes
c = 77: OK, 1 bytes
c = 78: OK, 1 bytes
c = 79: OK, 1 bytes
c = 80: OK, 1 bytes
c = 81: OK, 1 bytes
c = 82: OK, 1 bytes
c = 83: OK, 1 bytes
c = 84: OK, 1 bytes
c = 85: OK, 1 bytes
c = 86: OK, 1 bytes
c = 87: OK, 1 bytes
c = 88: OK, 1 bytes
c = 89: OK, 1 bytes
c = 90: OK, 1 bytes
c = 91: OK, 1 bytes
c = 92: OK, 1 bytes
c = 93: OK, 1 bytes
c = 94: OK, 1 bytes
c = 95: OK, 1 bytes
c = 96: OK, 1 bytes
c = 97: OK, 1 bytes
c = 98: OK, 1 bytes
c = 99: OK, 1 bytes
c = 100: OK, 1 bytes
c = 101: OK, 1 bytes
c = 102: OK, 1 bytes
c = 103: OK, 1 bytes
c = 104: OK, 1 bytes
c = 105: OK, 1 bytes
c = 106: OK, 1 bytes
c = 107: OK, 1 bytes
c = 108: OK, 1 bytes
c = 109: OK, 1 bytes
c = 110: OK, 1 bytes
c = 111: OK, 1 bytes
c = 112: OK, 1 bytes
c = 113: OK, 1 bytes
c = 114: OK, 1 bytes
c = 115: OK, 1 bytes
c = 116: OK, 1 bytes
c = 117: OK, 1 bytes
c = 118: OK, 1 bytes
c = 119: OK, 1 bytes
c = 120: OK, 1 bytes
c = 121: OK, 1 bytes
c = 122: OK, 1 bytes
c = 123: OK, 1 bytes
c = 124: OK, 1 bytes
c = 125: OK, 1 bytes
c = 126: OK, 1 bytes
c = 127: OK, 1 bytes
c = 128: OK, 1 bytes
c = 129: OK, 1 bytes
c = 130: OK, 1 bytes
c = 131: OK, 1 bytes
c = 132: OK, 1 bytes
c = 133: OK, 1 bytes
c = 134: OK, 1 bytes
c = 135: OK, 1 bytes
c = 136: OK, 1 bytes
c = 137: OK, 1 bytes
c = 138: OK, 1 bytes
c = 139: OK, 1 bytes
c = 140: OK, 1 bytes
c = 141: OK, 1 bytes
c = 142: OK, 1 bytes
c = 143: OK, 1 bytes
c = 144: OK, 1 bytes
c = 145: OK, 1 bytes
c = 146: OK, 1 bytes
c = 147: OK, 1 bytes
c = 148: OK, 1 bytes
c = 149: OK, 1 bytes
c = 150: OK, 1 bytes
c = 151: OK, 1 bytes
c = 152: OK, 1 bytes
c = 153: OK, 1 bytes
c = 154: OK, 1 bytes
c = 155: OK, 1 bytes
c = 156: OK, 1 bytes
c = 157: OK, 1 bytes
c = 158: OK, 1 bytes
c = 159: OK, 1 bytes
c = 160: OK, 1 bytes
c = 161: OK, 1 bytes
c = 162: OK, 1 bytes
c = 163: OK, 1 bytes
c = 164: OK, 1 bytes
c = 165: OK, 1 bytes
c = 166: OK, 1 bytes
c = 167: OK, 1 bytes
c = 168: OK, 1 bytes
c = 169: OK, 1 bytes
c = 170: OK, 1 bytes
c = 171: OK, 1 bytes
c = 172: OK, 1 bytes
c = 173: OK, 1 bytes
c = 174: OK, 1 bytes
c = 175: OK, 1 bytes
c = 176: OK, 1 bytes
c = 177: OK, 1 bytes
c = 178: OK, 1 bytes
c = 179: OK, 1 bytes
c = 180: OK, 1 bytes
c = 181: OK, 1 bytes
c = 182: OK, 1 bytes
c = 183: OK, 1 bytes
c = 184: OK, 1 bytes
c = 185: OK, 1 bytes
c = 186: OK, 1 bytes
c = 187: OK, 1 bytes
c = 188: OK, 1 bytes
c = 189: OK, 1 bytes
c = 190: OK, 1 bytes
c = 191: OK, 1 bytes
c = 192: OK, 1 bytes
c = 193: OK, 1 bytes
c = 194: OK, 1 bytes
c = 195: OK, 1 bytes
c = 196: OK, 1 bytes
c = 197: OK, 1 bytes
c = 198: OK, 1 bytes
c = 199: OK, 1 bytes
c = 200: OK, 1 bytes
c = 201: OK, 1 bytes
c = 202: OK, 1 bytes
c = 203: OK, 1 bytes
c = 204: OK, 1 bytes
c = 205: OK, 1 bytes
c = 206: OK, 1 bytes
c = 207: OK, 1 bytes
c = 208: OK, 1 bytes
c = 209: OK, 1 bytes
c = 210: OK, 1 bytes
c = 211: OK, 1 bytes
c = 212: OK, 1 bytes
c = 213: OK, 1 bytes
c = 214: OK, 1 bytes
c = 215: OK, 1 bytes
c = 216: OK, 1 bytes
c = 217: OK, 1 bytes
c = 218: OK, 1 bytes
c = 219: OK, 1 bytes
c = 220: OK, 1 bytes
c = 221: OK, 1 bytes
c = 222: OK, 1 bytes
c = 223: OK, 1 bytes
c = 224: OK, 1 bytes
c = 225: OK, 1 bytes
c = 226: OK, 1 bytes
c = 227: OK, 1 bytes
c = 228: OK, 1 bytes
c = 229: OK, 1 bytes
c = 230: OK, 1 bytes
c = 231: OK, 1 bytes
c = 232: OK, 1 bytes
c = 233: OK, 1 bytes
c = 234: OK, 1 bytes
c = 235: OK, 1 bytes
c = 236: OK, 1 bytes
c = 237: OK, 1 bytes
c = 238: OK, 1 bytes
c = 239: OK, 1 bytes
c = 240: OK, 1 bytes
c = 241: OK, 1 bytes
c = 242: OK, 1 bytes
c = 243: OK, 1 bytes
c = 244: OK, 1 bytes
c = 245: OK, 1 bytes
c = 246: OK, 1 bytes
c = 247: OK, 1 bytes
c = 248: OK, 1 bytes
c = 249: OK, 1 bytes
c = 250: OK, 1 bytes
c = 251: OK, 1 bytes
c = 252: OK, 1 bytes
c = 253: OK, 1 bytes
c = 254: OK, 1 bytes
c = 255: swprintf failed: Illegal byte sequence
This is a bug, because POSIX says that in the C / POSIX locale, "all byte
values are valid characters" [1].
Bruno
[1] https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbrtowc.html
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