From 9ee82d9d744de52916817412318f43f26960d719 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Tue, 21 Jan 2025 19:41:00 -0800
Subject: get-csv: rewrite in C.

* autload.c (csv_set_entries, csv_instantiate): Functions
removed.
(autoload_init): Autoload registration for stdlib/csv
removed.

* stdlib/csv.tl: File removed.

* stream.c (get_csv): New function.
(stream_init): Register get-csv intrinsic.

* stream.h (get_csv): Declared.
---
 stream.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

(limited to 'stream.c')

diff --git a/stream.c b/stream.c
index 51b8c4d9..8b9b2f60 100644
--- a/stream.c
+++ b/stream.c
@@ -5422,6 +5422,83 @@ val make_byte_input_stream(val obj)
   }
 }
 
+val get_csv(val source_opt)
+{
+  val source = if3(missingp(source_opt),
+                   std_input,
+                   if3(stringp(source_opt),
+                       make_string_input_stream(source_opt),
+                       source_opt));
+  val record = vector(zero, nil);
+  val field = mkstring(zero, chr(' '));
+  enum { rfield, qfield, quot } state = rfield;
+  int done = 0;
+
+  while (!done) {
+    val ch = get_char(source);
+
+    if (ch == chr('\r')) {
+      val ch2 = get_char(source);
+      if (ch2 == chr('\n'))
+        ch = ch2;
+      else if (ch2)
+        unget_char(ch2, source);
+    }
+
+    switch (state) {
+    case rfield:
+      if (ch == chr('\n')) {
+        vec_push(record, field);
+        done = 1;
+      } else if (ch == chr(',')) {
+        vec_push(record, field);
+        field = mkstring(zero, chr(' '));
+      } else if (ch == chr('"')) {
+        if (empty(field))
+          state = qfield;
+        else
+          string_extend(field, ch, nil);
+      } else if (ch == nil) {
+        vec_push(record, field);
+        done = 1;
+      } else {
+        string_extend(field, ch, nil);
+      }
+      break;
+    case qfield:
+      if (ch == chr('"')) {
+        state = quot;
+      } else if (ch == nil) {
+        vec_push(record, field);
+        done = 1;
+      } else {
+        string_extend(field, ch, nil);
+      }
+      break;
+    case quot:
+      if (ch == chr(',')) {
+        vec_push(record, field);
+        field = mkstring(zero, chr(' '));
+        state = rfield;
+      } else if (ch == chr('"')) {
+        string_extend(field, ch, nil);
+        state = qfield;
+      } else if (ch == chr('\n')) {
+        vec_push(record, field);
+        done = 1;
+      } else if (ch == nil) {
+        vec_push(record, field);
+        done = 1;
+      } else {
+        string_extend(field, ch, nil);
+        state = rfield;
+      }
+    }
+  }
+
+  return record;
+}
+
 val tmpfile_wrap(void)
 {
   val self = lit("tmpfile");
@@ -5697,6 +5774,7 @@ void stream_init(void)
   reg_varl(intern(lit("indent-data"), user_package), num_fast(indent_data));
   reg_varl(intern(lit("indent-code"), user_package), num_fast(indent_code));
   reg_varl(intern(lit("indent-foff"), user_package), num_fast(indent_foff));
+  reg_fun(intern(lit("get-csv"), user_package), func_n1o(get_csv, 0));
   reg_fun(intern(lit("tmpfile"), user_package), func_n0(tmpfile_wrap));
 #if HAVE_MKDTEMP
   reg_fun(intern(lit("mkdtemp"), user_package), func_n1(mkdtemp_wrap));
-- 
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