From 1168c8ab426105bcd1b65aaf1f62c7a6144b0ae8 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom@tomsmeding.com>
Date: Sun, 14 Jul 2024 10:25:56 +0200
Subject: file_lines module, herschrijf omd ermee

---
 src/omd.c | 82 ++++++++-------------------------------------------------------
 1 file changed, 10 insertions(+), 72 deletions(-)

(limited to 'src/omd.c')

diff --git a/src/omd.c b/src/omd.c
index b43538a..aa48ee0 100644
--- a/src/omd.c
+++ b/src/omd.c
@@ -3,6 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include "io/lines.h"
 #include "util/versie.h"
 #include "util/error.h"
 #include "util/debug.h"
@@ -48,83 +49,20 @@ static void reverse_in_place(char *buf, size_t len) {
 }
 
 static void process(const char *fname, FILE *f) {
-  size_t cap = 4096;
-  char *buffer = malloc(cap);
-  if (!buffer) print_error_nomem("omd");
-
-  size_t cursor = 0;
+  struct file_lines fl;
+  if (!file_lines_open("omd", fname, f, &fl)) exit(1);
 
   while (true) {
-    DEBUG("cursor=%zu\n", cursor);
-
-    // read a line
-    size_t linelen = 0;
-    while (true) {
-      // grow buffer when small
-      if (cap - cursor < 1024) {
-        cap *= 2;
-        if (cap == 0) {
-          fprintf(stderr, "omd: Regel te lang\n");
-          exit(1);
-        }
-        DEBUG("realloc to cap %zu\n", cap);
-        buffer = realloc(buffer, cap);
-        if (!buffer) print_error_nomem("omd");
-      }
+    struct string_view sv;
+    if (!file_lines_read(&fl, &sv)) break;
 
-      size_t nr = fread(buffer + cursor, 1, cap - cursor, f);
-      DEBUG("nr=%zu\n", nr);
-      if (nr == 0) {
-        if (feof(f)) {
-          if (cursor == 0) return;
-          linelen = cursor;
-          break;
-        }
-        if (fname) fprintf(stderr, "omd: Fout bij lezen van bestand '%s'\n", fname);
-        else fprintf(stderr, "omd: Fout bij lezen van standaardinvoer\n");
-        exit(1);
-      }
-      char *p = memchr(buffer + cursor, '\n', nr);
-      cursor += nr;
-      if (p != NULL) {
-        linelen = p - buffer;
-        break;
-      }
-    }
-
-    DEBUG("line with len %zu (cursor=%zu)\n", linelen, cursor);
-
-    // we have a newline at cursor+linelen; print all lines that we already have in full
-    size_t linestart = 0;
-    while (true) {
-      reverse_in_place(buffer + linestart, linelen);
-      if (linestart + linelen < cap && buffer[linestart + linelen] == '\n') {
-        size_t nw = fwrite(buffer + linestart, 1, linelen + 1, stdout);
-        if (nw < linelen + 1) exit(1);
-      } else {
-        size_t nw = fwrite(buffer + linestart, 1, linelen, stdout);
-        if (nw < linelen) exit(1);
-        putchar('\n');
-        // no newline in the buffer but nevertheless a completed line means that input is at EOF
-        goto cleanup;
-      }
-
-      linestart += linelen + 1;
-      char *p = memchr(buffer + linestart, '\n', cursor - linestart);
-      if (p == NULL) {
-        DEBUG("no more newlines, moving back from %zu len %zu\n", linestart, cursor - linestart);
-        // move back whatever we have left
-        memmove(buffer, buffer + linestart, cursor - linestart);
-        cursor -= linestart;
-        break;
-      }
-      linelen = p - (buffer + linestart);
-      DEBUG("next line from %zu len %zu\n", linestart, linelen);
-    }
+    reverse_in_place(sv.s, sv.len);
+    size_t nw = fwrite(sv.s, 1, sv.len, stdout);
+    if (nw < sv.len) exit(1);
+    putchar('\n');
   }
 
-cleanup:
-  free(buffer);
+  file_lines_close(&fl);
 }
 
 int entry_omd(int argc, char **argv) {
-- 
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