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Introduce common strcasecmp and strncasecmp implementations (#23840)

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This commit is contained in:
Bryson Miller
2025-05-15 01:58:33 -07:00
committed by GitHub
parent bc377183ce
commit 08d534e8d8
5 changed files with 64 additions and 37 deletions
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64
lib/c/string.zig
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@@ -6,6 +6,12 @@ comptime {
@export(&strcmp, .{ .name = "strcmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&strlen, .{ .name = "strlen", .linkage = common.linkage, .visibility = common.visibility });
@export(&strncmp, .{ .name = "strncmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&strcasecmp, .{ .name = "strcasecmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&strncasecmp, .{ .name = "strncasecmp", .linkage = common.linkage, .visibility = common.visibility });
@export(&__strcasecmp_l, .{ .name = "__strcasecmp_l", .linkage = common.linkage, .visibility = common.visibility });
@export(&__strncasecmp_l, .{ .name = "__strncasecmp_l", .linkage = common.linkage, .visibility = common.visibility });
@export(&__strcasecmp_l, .{ .name = "strcasecmp_l", .linkage = .weak, .visibility = common.visibility });
@export(&__strncasecmp_l, .{ .name = "strncasecmp_l", .linkage = .weak, .visibility = common.visibility });
}
fn strcmp(s1: [*:0]const c_char, s2: [*:0]const c_char) callconv(.c) c_int {
@@ -33,6 +39,64 @@ fn strncmp(s1: [*:0]const c_char, s2: [*:0]const c_char, n: usize) callconv(.c)
return @as(c_int, l[0]) - @as(c_int, r[0]);
}
fn strcasecmp(s1: [*:0]const c_char, s2: [*:0]const c_char) callconv(.c) c_int {
const toLower = std.ascii.toLower;
var l: [*:0]const u8 = @ptrCast(s1);
var r: [*:0]const u8 = @ptrCast(s2);
while (l[0] != 0 and r[0] != 0 and (l[0] == r[0] or toLower(l[0]) == toLower(r[0]))) {
l += 1;
r += 1;
}
return @as(c_int, toLower(l[0])) - @as(c_int, toLower(r[0]));
}
fn __strcasecmp_l(s1: [*:0]const c_char, s2: [*:0]const c_char, locale: *anyopaque) callconv(.c) c_int {
_ = locale;
return strcasecmp(s1, s2);
}
fn strncasecmp(s1: [*:0]const c_char, s2: [*:0]const c_char, n: usize) callconv(.c) c_int {
const toLower = std.ascii.toLower;
var l: [*:0]const u8 = @ptrCast(s1);
var r: [*:0]const u8 = @ptrCast(s2);
var i = n - 1;
while (l[0] != 0 and r[0] != 0 and i != 0 and (l[0] == r[0] or toLower(l[0]) == toLower(r[0]))) {
l += 1;
r += 1;
i -= 1;
}
return @as(c_int, toLower(l[0])) - @as(c_int, toLower(r[0]));
}
fn __strncasecmp_l(s1: [*:0]const c_char, s2: [*:0]const c_char, n: usize, locale: *anyopaque) callconv(.c) c_int {
_ = locale;
return strncasecmp(s1, s2, n);
}
test strcasecmp {
try std.testing.expect(strcasecmp(@ptrCast("a"), @ptrCast("b")) < 0);
try std.testing.expect(strcasecmp(@ptrCast("b"), @ptrCast("a")) > 0);
try std.testing.expect(strcasecmp(@ptrCast("A"), @ptrCast("b")) < 0);
try std.testing.expect(strcasecmp(@ptrCast("b"), @ptrCast("A")) > 0);
try std.testing.expect(strcasecmp(@ptrCast("A"), @ptrCast("A")) == 0);
try std.testing.expect(strcasecmp(@ptrCast("B"), @ptrCast("b")) == 0);
try std.testing.expect(strcasecmp(@ptrCast("bb"), @ptrCast("AA")) > 0);
}
test strncasecmp {
try std.testing.expect(strncasecmp(@ptrCast("a"), @ptrCast("b"), 1) < 0);
try std.testing.expect(strncasecmp(@ptrCast("b"), @ptrCast("a"), 1) > 0);
try std.testing.expect(strncasecmp(@ptrCast("A"), @ptrCast("b"), 1) < 0);
try std.testing.expect(strncasecmp(@ptrCast("b"), @ptrCast("A"), 1) > 0);
try std.testing.expect(strncasecmp(@ptrCast("A"), @ptrCast("A"), 1) == 0);
try std.testing.expect(strncasecmp(@ptrCast("B"), @ptrCast("b"), 1) == 0);
try std.testing.expect(strncasecmp(@ptrCast("bb"), @ptrCast("AA"), 2) > 0);
}
test strncmp {
try std.testing.expect(strncmp(@ptrCast("a"), @ptrCast("b"), 1) < 0);
try std.testing.expect(strncmp(@ptrCast("a"), @ptrCast("c"), 1) < 0);