5 files changed, 146 insertions, 0 deletions
diff --git a/system/libraries/string/builder.zig b/system/libraries/string/builder.zig
new file mode 100644
index 0000000..16bd35c
--- /dev/null
+++ b/system/libraries/string/builder.zig
@@ -0,0 +1,48 @@
+//! String building
+
+pub fn build(buf: []u8, parts: anytype) []const u8 {
+    var pos: usize = 0;
+    inline for (parts) |part| {
+        for (part) |c| {
+            if (pos >= buf.len) break;
+            buf[pos] = c;
+            pos += 1;
+        }
+    }
+    return buf[0..pos];
+}
+
+pub fn concat(buf: []u8, a: []const u8, b: []const u8) []const u8 {
+    var pos: usize = 0;
+    for (a) |c| {
+        if (pos >= buf.len) break;
+        buf[pos] = c;
+        pos += 1;
+    }
+    for (b) |c| {
+        if (pos >= buf.len) break;
+        buf[pos] = c;
+        pos += 1;
+    }
+    return buf[0..pos];
+}
+
+pub fn concat3(buf: []u8, a: []const u8, b: []const u8, c: []const u8) []const u8 {
+    var pos: usize = 0;
+    for (a) |ch| {
+        if (pos >= buf.len) break;
+        buf[pos] = ch;
+        pos += 1;
+    }
+    for (b) |ch| {
+        if (pos >= buf.len) break;
+        buf[pos] = ch;
+        pos += 1;
+    }
+    for (c) |ch| {
+        if (pos >= buf.len) break;
+        buf[pos] = ch;
+        pos += 1;
+    }
+    return buf[0..pos];
+}
diff --git a/system/libraries/string/cstring.zig b/system/libraries/string/cstring.zig
new file mode 100644
index 0000000..32ad60f
--- /dev/null
+++ b/system/libraries/string/cstring.zig
@@ -0,0 +1,17 @@
+//! C-string utilities
+
+pub fn len(str: [*:0]const u8) usize {
+    var i: usize = 0;
+    while (str[i] != 0) : (i += 1) {}
+    return i;
+}
+
+pub fn toSlice(str: [*:0]const u8) []const u8 {
+    return str[0..len(str)];
+}
+
+pub fn findNull(buf: []const u8) usize {
+    var i: usize = 0;
+    while (i < buf.len and buf[i] != 0) : (i += 1) {}
+    return i;
+}
diff --git a/system/libraries/string/location.zig b/system/libraries/string/location.zig
new file mode 100644
index 0000000..ff1c915
--- /dev/null
+++ b/system/libraries/string/location.zig
@@ -0,0 +1,59 @@
+//! Location utilities
+
+pub fn getStackName(location: []const u8) []const u8 {
+    if (location.len == 0 or (location.len == 1 and location[0] == '/')) {
+        return "/";
+    }
+
+    var last_slash: usize = 0;
+    for (location, 0..) |c, i| {
+        if (c == '/') {
+            last_slash = i;
+        }
+    }
+
+    if (last_slash == location.len - 1 and location.len > 1) {
+        var i: usize = location.len - 2;
+        while (i > 0) : (i -= 1) {
+            if (location[i] == '/') {
+                return location[i + 1 .. location.len - 1];
+            }
+        }
+        return location[1 .. location.len - 1];
+    }
+
+    if (last_slash + 1 < location.len) {
+        return location[last_slash + 1 ..];
+    }
+
+    return location;
+}
+
+pub fn parent(location: []const u8, buf: []u8) []const u8 {
+    if (location.len <= 1) {
+        buf[0] = '/';
+        return buf[0..1];
+    }
+
+    var end = location.len;
+    if (location[end - 1] == '/') {
+        end -= 1;
+    }
+
+    var i: usize = end;
+    while (i > 0) : (i -= 1) {
+        if (location[i - 1] == '/') {
+            if (i == 1) {
+                buf[0] = '/';
+                return buf[0..1];
+            }
+            for (location[0 .. i - 1], 0..) |c, j| {
+                buf[j] = c;
+            }
+            return buf[0 .. i - 1];
+        }
+    }
+
+    buf[0] = '/';
+    return buf[0..1];
+}
diff --git a/system/libraries/string/string.zig b/system/libraries/string/string.zig
new file mode 100644
index 0000000..1d7c798
--- /dev/null
+++ b/system/libraries/string/string.zig
@@ -0,0 +1,16 @@
+//! String utilities
+
+pub const cstring = @import("cstring.zig");
+pub const location = @import("location.zig");
+pub const builder = @import("builder.zig");
+
+pub const len = cstring.len;
+pub const toSlice = cstring.toSlice;
+pub const findNull = cstring.findNull;
+
+pub const getStackName = location.getStackName;
+pub const parent = location.parent;
+
+pub const build = builder.build;
+pub const concat = builder.concat;
+pub const concat3 = builder.concat3;
diff --git a/system/libraries/string/string.zon b/system/libraries/string/string.zon
new file mode 100644
index 0000000..e722bf8
--- /dev/null
+++ b/system/libraries/string/string.zon
@@ -0,0 +1,6 @@
+.{
+    .name = "string",
+    .version = "1.0.0",
+    .type = .library,
+    .entry = "string.zig",
+}