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(from_header): Handle 32-bit two's complement negative time stamps

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even if the leading octal digit is 2 or 3.
This commit is contained in:
Paul Eggert
1999-11-07 21:06:38 +00:00
parent 0ca48105ea
commit 26505948d9
1 changed files with 13 additions and 4 deletions
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src/list.c
+13 -4
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@@ -565,16 +565,25 @@ from_header (char const *where0, size_t digs, char const *type,
}
/* Parse the output of older, unportable tars, which generate
negative values in two's complement octal. */
if ((overflow || maxval < value) && '4' <= *where1)
negative values in two's complement octal. If the leading
nonzero digit is 1, we can't recover the original value
reliably; so do this only if the digit is 2 or more. This
catches the common case of 32-bit negative time stamps. */
if ((overflow || maxval < value) && '2' <= *where1)
{
/* Compute the negative of the input value, assuming two's
complement. */
for (value = 0, where = where1, overflow = 0; ; )
int digit = (*where1 - '0') | 4;
overflow = 0;
value = 0;
where = where1;
for (;;)
{
value += 7 - (*where++ - '0');
value += 7 - digit;
where++;
if (where == lim || ! ISODIGIT (*where))
break;
digit = *where - '0';
overflow |= value ^ (value << LG_8 >> LG_8);
value <<= LG_8;
}