From 0fa6d4209ff9b4a95e7d1955887aa4c73ee3423c Mon Sep 17 00:00:00 2001
From: t <t@tjp.lol>
Date: Mon, 6 Jul 2026 16:39:32 -0600
Subject: expose openai_responses API style to C and Go bindings

---
 libpanto-c/src/lib.zig | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'libpanto-c/src')

diff --git a/libpanto-c/src/lib.zig b/libpanto-c/src/lib.zig
index 7f61ae3..4fcf94b 100644
--- a/libpanto-c/src/lib.zig
+++ b/libpanto-c/src/lib.zig
@@ -26,7 +26,7 @@ const MessageBuilder = struct { role: panto.MessageRole, blocks: std.ArrayList(p
 pub const PantoSlice = extern struct { ptr: ?[*]const u8, len: usize };
 pub const PantoStatus = enum(c_int) { ok = 0, err = 1 };
 pub const PantoNextStatus = enum(c_int) { event = 0, done = 1, err = 2 };
-pub const PantoAPIStyle = enum(c_int) { openai_chat = 0, anthropic_messages = 1 };
+pub const PantoAPIStyle = enum(c_int) { openai_chat = 0, anthropic_messages = 1, openai_responses = 2, openai_codex_responses = 3 };
 pub const PantoReasoningEffort = enum(c_int) { default = 0, off, minimal, low, medium, high };
 pub const PantoThinking = enum(c_int) { disabled = 0, enabled, adaptive };
 pub const PantoEffort = enum(c_int) { low = 0, medium, high, xhigh, max };
@@ -40,8 +40,9 @@ pub const PantoSessionInfo = extern struct { id: PantoSlice, created: PantoSlice
 pub const PantoSessionInfoList = extern struct { ptr: ?[*]PantoSessionInfo, len: usize };
 pub const PantoSessionResult = extern struct { found: bool, session: ?*PantoSession };
 pub const PantoOpenAIChatConfig = extern struct { api_key: ?[*:0]const u8, base_url: ?[*:0]const u8, model: ?[*:0]const u8, reasoning: PantoReasoningEffort, max_tokens: u32 };
+pub const PantoOpenAIResponsesConfig = extern struct { api_key: ?[*:0]const u8, base_url: ?[*:0]const u8, model: ?[*:0]const u8, reasoning: PantoReasoningEffort, max_tokens: u32 };
 pub const PantoAnthropicMessagesConfig = extern struct { api_key: ?[*:0]const u8, base_url: ?[*:0]const u8, model: ?[*:0]const u8, api_version: ?[*:0]const u8, max_tokens: u32, thinking: PantoThinking, effort: PantoEffort, has_thinking_budget_tokens: bool, thinking_budget_tokens: u32, thinking_interleaved: bool };
-pub const PantoProviderConfig = extern struct { tag: PantoAPIStyle, data: extern union { openai_chat: PantoOpenAIChatConfig, anthropic_messages: PantoAnthropicMessagesConfig } };
+pub const PantoProviderConfig = extern struct { tag: PantoAPIStyle, data: extern union { openai_chat: PantoOpenAIChatConfig, anthropic_messages: PantoAnthropicMessagesConfig, openai_responses: PantoOpenAIResponsesConfig } };
 pub const PantoCompactionConfig = extern struct { keep_verbatim: u32, has_model: bool, model: PantoProviderConfig, has_compaction_prompt: bool, compaction_prompt: ?[*:0]const u8 };
 pub const PantoRetryConfig = extern struct { max_attempts: usize, initial_delay_ms: u64, max_delay_ms: u64, multiplier: f64, jitter: bool };
 pub const PantoConfig = extern struct { provider: PantoProviderConfig, compaction: PantoCompactionConfig, retry: PantoRetryConfig };
@@ -485,6 +486,8 @@ fn convertProvider(p: PantoProviderConfig) !panto.ProviderConfig {
     return switch (p.tag) {
         .openai_chat => .{ .openai_chat = .{ .api_key = try dupCStr(p.data.openai_chat.api_key), .base_url = try dupCStr(p.data.openai_chat.base_url), .model = try dupCStr(p.data.openai_chat.model), .reasoning = @enumFromInt(@intFromEnum(p.data.openai_chat.reasoning)), .max_tokens = p.data.openai_chat.max_tokens } },
         .anthropic_messages => .{ .anthropic_messages = .{ .api_key = try dupCStr(p.data.anthropic_messages.api_key), .base_url = try dupCStr(p.data.anthropic_messages.base_url), .model = try dupCStr(p.data.anthropic_messages.model), .api_version = if (cstr(p.data.anthropic_messages.api_version).len == 0) "2023-06-01" else try dupCStr(p.data.anthropic_messages.api_version), .max_tokens = p.data.anthropic_messages.max_tokens, .thinking = @enumFromInt(@intFromEnum(p.data.anthropic_messages.thinking)), .effort = @enumFromInt(@intFromEnum(p.data.anthropic_messages.effort)), .thinking_budget_tokens = if (p.data.anthropic_messages.has_thinking_budget_tokens) p.data.anthropic_messages.thinking_budget_tokens else null, .thinking_interleaved = p.data.anthropic_messages.thinking_interleaved } },
+        .openai_responses => .{ .openai_responses = .{ .api_key = try dupCStr(p.data.openai_responses.api_key), .base_url = try dupCStr(p.data.openai_responses.base_url), .model = try dupCStr(p.data.openai_responses.model), .reasoning = @enumFromInt(@intFromEnum(p.data.openai_responses.reasoning)), .max_tokens = p.data.openai_responses.max_tokens } },
+        .openai_codex_responses => return error.UnsupportedProvider,
     };
 }
 fn freeConfig(c: *panto.Config) void {
@@ -506,9 +509,6 @@ fn freeProvider(pv: *panto.ProviderConfig) void {
             allocator.free(c.model);
             if (c.api_version.ptr != "2023-06-01".ptr) allocator.free(c.api_version);
         },
-        // The Responses styles are not constructible across the C ABI (no
-        // PantoAPIStyle variant), so `convertProvider` never builds them; these
-        // cases exist only to keep the union switch exhaustive.
         .openai_responses, .openai_codex_responses => |c| {
             allocator.free(c.api_key);
             allocator.free(c.base_url);
-- 
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