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cmSystemTools: Re-implement IsOn,IsOff with manual branching

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Replace use of std::string allocation, std::set lookups, and toupper
conversions with explicit manual logic to do case-insensitive
recognition of a specific set of strings.
This commit is contained in:
Brad King 2018-08-30 14:41:54 -04:00
parent 1fa0f2bd03
commit 1bfe6991ff
1 changed files with 56 additions and 35 deletions
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91
Source/cmSystemTools.cxx
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@ -42,7 +42,6 @@
#include <ctype.h>
#include <errno.h>
#include <iostream>
#include <set>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>
@ -372,24 +371,31 @@ bool cmSystemTools::IsOn(const char* val)
if (!val) {
return false;
}
size_t len = strlen(val);
if (len > 4) {
return false;
/* clang-format off */
// "1"
if (val[0] == '1' && val[1] == '\0') {
return true;
}
std::string v(val, len);
static std::set<std::string> onValues;
if (onValues.empty()) {
onValues.insert("ON");
onValues.insert("1");
onValues.insert("YES");
onValues.insert("TRUE");
onValues.insert("Y");
// "ON"
if ((val[0] == 'O' || val[0] == 'o') &&
(val[1] == 'N' || val[1] == 'n') && val[2] == '\0') {
return true;
}
for (char& c : v) {
c = static_cast<char>(toupper(c));
// "Y", "YES"
if ((val[0] == 'Y' || val[0] == 'y') && (val[1] == '\0' || (
(val[1] == 'E' || val[1] == 'e') &&
(val[2] == 'S' || val[2] == 's') && val[3] == '\0'))) {
return true;
}
return (onValues.count(v) > 0);
// "TRUE"
if ((val[0] == 'T' || val[0] == 't') &&
(val[1] == 'R' || val[1] == 'r') &&
(val[2] == 'U' || val[2] == 'u') &&
(val[3] == 'E' || val[3] == 'e') && val[4] == '\0') {
return true;
}
/* clang-format on */
return false;
}
bool cmSystemTools::IsOn(const std::string& val)
@ -407,30 +413,45 @@ bool cmSystemTools::IsNOTFOUND(const char* val)
bool cmSystemTools::IsOff(const char* val)
{
if (!val || !*val) {
// ""
if (!val || val[0] == '\0') {
return true;
}
size_t len = strlen(val);
// Try and avoid toupper() for large strings.
if (len > 6) {
return cmSystemTools::IsNOTFOUND(val);
/* clang-format off */
// "0"
if (val[0] == '0' && val[1] == '\0') {
return true;
}
static std::set<std::string> offValues;
if (offValues.empty()) {
offValues.insert("OFF");
offValues.insert("0");
offValues.insert("NO");
offValues.insert("FALSE");
offValues.insert("N");
offValues.insert("IGNORE");
// "OFF"
if ((val[0] == 'O' || val[0] == 'o') &&
(val[1] == 'F' || val[1] == 'f') &&
(val[2] == 'F' || val[2] == 'f') && val[3] == '\0') {
return true;
}
// Try and avoid toupper().
std::string v(val, len);
for (char& c : v) {
c = static_cast<char>(toupper(c));
// "N", "NO"
if ((val[0] == 'N' || val[0] == 'n') && (val[1] == '\0' || (
(val[1] == 'O' || val[1] == 'o') && val[2] == '\0'))) {
return true;
}
return (offValues.count(v) > 0);
// "FALSE"
if ((val[0] == 'F' || val[0] == 'f') &&
(val[1] == 'A' || val[1] == 'a') &&
(val[2] == 'L' || val[2] == 'l') &&
(val[3] == 'S' || val[3] == 's') &&
(val[4] == 'E' || val[4] == 'e') && val[5] == '\0') {
return true;
}
// "IGNORE"
if ((val[0] == 'I' || val[0] == 'i') &&
(val[1] == 'G' || val[1] == 'g') &&
(val[2] == 'N' || val[2] == 'n') &&
(val[3] == 'O' || val[3] == 'o') &&
(val[4] == 'R' || val[4] == 'r') &&
(val[5] == 'E' || val[5] == 'e') && val[6] == '\0') {
return true;
}
/* clang-format on */
return cmSystemTools::IsNOTFOUND(val);
}
bool cmSystemTools::IsOff(const std::string& val)