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simplified myatoi64()

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git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@5200 212acab6-be3b-0410-9dea-997c60f758d6
This commit is contained in:
kichik 2007-07-14 10:29:26 +00:00
parent 74bf17be17
commit 8f7c0e3679
1 changed files with 13 additions and 43 deletions
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56
Contrib/NSISdl/util.cpp
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@ -26,56 +26,26 @@ int my_atoi(char *s)
return (int)v;
}
// Updated for int64 and simple bitwise operations
__int64 myatoi64(char *s)
{
__int64 v=0;
// Check for right input
if (!s) return 0;
if (*s == '0' && (s[1] == 'x' || s[1] == 'X'))
{
s++;
for (;;)
{
int c=*(++s);
if (c >= '0' && c <= '9') c-='0';
else if (c >= 'a' && c <= 'f') c-='a'-10;
else if (c >= 'A' && c <= 'F') c-='A'-10;
else break;
v<<=4;
v+=c;
}
}
else if (*s == '0' && s[1] <= '7' && s[1] >= '0')
{
for (;;)
{
int c=*(++s);
if (c >= '0' && c <= '7') c-='0';
else break;
v<<=3;
v+=c;
}
}
int sign=0;
if (*s == '-')
sign++;
else
s--;
for (;;)
{
int sign=0;
if (*s == '-') sign++; else s--;
for (;;)
{
int c=*(++s) - '0';
if (c < 0 || c > 9) break;
v*=10;
v+=c;
}
if (sign) v = -v;
int c=*(++s) - '0';
if (c < 0 || c > 9) break;
v*=10;
v+=c;
}
// Support for simple ORed expressions
if (*s == '|')
{
v |= myatoi64(s+1);
}
if (sign)
v = -v;
return v;
}