添加信号处理

src/buffer.c

@@ -0,0 +1,37 @@
+#include "buffer.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include "utils.h"
+
+char buffer_slop[1];
+
+void buffer_ensure(buffer_t *buf, int newlen) {
+  if (newlen < 0) exit(EX_SOFTWARE);
+
+  if (newlen < buf->size) return;
+
+  if (newlen < buf->offs + buf->size && buf->offs > buf->size / 4) {
+    /* Data fits in the current area, shift it left */
+    memmove(buf->s - buf->offs, buf->s, buf->len + 1);
+    buf->s -= buf->offs;
+    buf->size += buf->offs;
+    buf->offs = 0;
+    return;
+  }
+
+  buf->size = p_alloc_nr(buf->size + buf->offs);
+  if (buf->size < newlen + 1) buf->size = newlen + 1;
+  if (buf->alloced && !buf->offs)
+    p_realloc(&buf->s, buf->size);
+  else {
+    char *new_area = xmalloc(buf->size);
+    memcpy(new_area, buf->s, buf->len + 1);
+    if (buf->alloced) free(buf->s - buf->offs);
+    buf->alloced = true;
+    buf->s = new_area;
+    buf->offs = 0;
+  }
+}