Serving pages

1 files changed, 90 insertions, 15 deletions

diff --git a/src/c/lacweb.c b/src/c/lacweb.c
index 10ccd6a0..ef8e7184 100644
--- a/src/c/lacweb.c
+++ b/src/c/lacweb.c
@@ -1,16 +1,75 @@
+#include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <ctype.h>
 
 #include "types.h"
 
 lw_unit lw_unit_v = {};
 
-void lw_writec(char c) {
-  fputc(c, stdout);
+struct lw_context {
+  char *page, *page_front, *page_back;
+};
+
+lw_context lw_init(int page_len) {
+  lw_context ctx = malloc(sizeof(struct lw_context));
+  ctx->page_front = ctx->page = malloc(page_len);
+  ctx->page_back = ctx->page_front + page_len;
+  return ctx;
+}
+
+void lw_free(lw_context ctx) {
+  free(ctx->page);
+}
+
+int lw_really_send(int sock, const void *buf, ssize_t len) {
+  while (len > 0) {
+    ssize_t n = send(sock, buf, len, 0);
+
+    if (n < 0)
+      return n;
+
+    buf += n;
+    len -= n;
+  }
+
+  return 0;
 }
 
-void lw_write(const char* s) {
-  fputs(s, stdout);
+int lw_send(lw_context ctx, int sock) {
+  return lw_really_send(sock, ctx->page, ctx->page_front - ctx->page);
+}
+
+static void lw_check(lw_context ctx, size_t extra) {
+  size_t desired = ctx->page_back - ctx->page_front + extra, next;
+  char *new_page;
+
+  for (next = ctx->page_back - ctx->page_front; next < desired; next *= 2);
+
+  new_page = realloc(ctx->page, next);
+  ctx->page_front = new_page + (ctx->page_front - ctx->page);
+  ctx->page_back = new_page + (ctx->page_back - ctx->page);
+  ctx->page = new_page;
+}
+
+static void lw_writec_unsafe(lw_context ctx, char c) {
+  *(ctx->page_front)++ = c;
+}
+
+void lw_writec(lw_context ctx, char c) {
+  lw_check(ctx, 1);
+  lw_writec_unsafe(ctx, c);
+}
+
+static void lw_write_unsafe(lw_context ctx, const char* s) {
+  int len = strlen(s);
+  memcpy(ctx->page_front, s, len);
+  ctx->page_front += len;
+}
+
+void lw_write(lw_context ctx, const char* s) {
+  lw_check(ctx, strlen(s));
+  lw_write_unsafe(ctx, s);
 }
 
 char *lw_Basis_attrifyInt(lw_Basis_int n) {
@@ -25,27 +84,43 @@ char *lw_Basis_attrifyString(lw_Basis_string s) {
   return "";
 }
 
-char *lw_Basis_attrifyInt_w(lw_Basis_int n) {
-  printf("%d", n);
+#define INTS_MAX 50
+#define FLOATS_MAX 100
+
+static void lw_Basis_attrifyInt_w_unsafe(lw_context ctx, lw_Basis_int n) {
+  int len;
+
+  sprintf(ctx->page_front, "%d%n", n, &len);
+  ctx->page_front += len;
+}
+
+void lw_Basis_attrifyInt_w(lw_context ctx, lw_Basis_int n) {
+  lw_check(ctx, INTS_MAX);
+  lw_Basis_attrifyInt_w_unsafe(ctx, n);
 }
 
-char *lw_Basis_attrifyFloat_w(lw_Basis_float n) {
-  printf("%g", n);
+void lw_Basis_attrifyFloat_w(lw_context ctx, lw_Basis_float n) {
+  int len;
+
+  lw_check(ctx, FLOATS_MAX);
+  sprintf(ctx->page_front, "%g%n", n, &len);
+  ctx->page_front += len;
 }
 
-char *lw_Basis_attrifyString_w(lw_Basis_string s) {
+void lw_Basis_attrifyString_w(lw_context ctx, lw_Basis_string s) {
+  lw_check(ctx, strlen(s) * 6);
+
   for (; *s; s++) {
     char c = *s;
 
     if (c == '"')
-      lw_write("&quot;");
+      lw_write_unsafe(ctx, "&quot;");
     else if (isprint(c))
-      lw_writec(c);
+      lw_writec_unsafe(ctx, c);
     else {
-      lw_write("&#");
-      lw_Basis_attrifyInt_w(c);
-      lw_writec(';');
+      lw_write_unsafe(ctx, "&#");
+      lw_Basis_attrifyInt_w_unsafe(ctx, c);
+      lw_writec_unsafe(ctx, ';');
     }
   }
-  lw_write(s);
 }