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ascii to unsigned integer

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R=rsc
DELTA=60  (35 added, 17 deleted, 8 changed)
OCL=18339
CL=18343
This commit is contained in:
Rob Pike 2008-11-03 11:40:33 -08:00
parent f618f8940d
commit 6524b82fed
1 changed files with 37 additions and 19 deletions
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56
src/lib/strings.go
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@ -116,23 +116,9 @@ export func join(a *[]string, sep string) string {
return string(b) return string(b)
} }
// Convert decimal string to integer. // Convert decimal string to unsigned integer.
// TODO: Doesn't check for overflow. // TODO: Doesn't check for overflow.
export func atol(s string) (i int64, ok bool) { export func atoui64(s string) (i uint64, ok bool) {
// empty string bad
if len(s) == 0 {
return 0, false
}
// pick off leading sign
neg := false;
if s[0] == '+' {
s = s[1:len(s)]
} else if s[0] == '-' {
neg = true;
s = s[1:len(s)]
}
// empty string bad // empty string bad
if len(s) == 0 { if len(s) == 0 {
return 0, false return 0, false
@ -149,21 +135,53 @@ export func atol(s string) (i int64, ok bool) {
} }
// parse number // parse number
n := int64(0); n := uint64(0);
for i := 0; i < len(s); i++ { for i := 0; i < len(s); i++ {
if s[i] < '0' || s[i] > '9' { if s[i] < '0' || s[i] > '9' {
return 0, false return 0, false
} }
n = n*10 + int64(s[i] - '0') n = n*10 + uint64(s[i] - '0')
} }
return n, true
}
// Convert decimal string to integer.
// TODO: Doesn't check for overflow.
export func atoi64(s string) (i int64, ok bool) {
// empty string bad
if len(s) == 0 {
return 0, false
}
// pick off leading sign
neg := false;
if s[0] == '+' {
s = s[1:len(s)]
} else if s[0] == '-' {
neg = true;
s = s[1:len(s)]
}
var un uint64;
un, ok = atoui64(s);
if !ok {
return 0, false
}
n := int64(un);
if neg { if neg {
n = -n n = -n
} }
return n, true return n, true
} }
export func atoui(s string) (i uint, ok bool) {
ii, okok := atoui64(s);
i = uint(ii);
return i, okok
}
export func atoi(s string) (i int, ok bool) { export func atoi(s string) (i int, ok bool) {
ii, okok := atol(s); ii, okok := atoi64(s);
i = int(ii); i = int(ii);
return i, okok return i, okok
} }