feat(xml): add XML functions

vendor/expat-2.0.1/xmlwf/readfilemap.c

@@ -0,0 +1,98 @@
+/* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
+   See the file COPYING for copying permission.
+*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef __WATCOMC__
+#ifndef __LINUX__
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+#endif
+
+#ifdef __BEOS__
+#include <unistd.h>
+#endif
+
+#ifndef S_ISREG
+#ifndef S_IFREG
+#define S_IFREG _S_IFREG
+#endif
+#ifndef S_IFMT
+#define S_IFMT _S_IFMT
+#endif
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#endif /* not S_ISREG */
+
+#ifndef O_BINARY
+#ifdef _O_BINARY
+#define O_BINARY _O_BINARY
+#else
+#define O_BINARY 0
+#endif
+#endif
+
+#include "filemap.h"
+
+int
+filemap(const char *name,
+        void (*processor)(const void *, size_t, const char *, void *arg),
+        void *arg)
+{
+  size_t nbytes;
+  int fd;
+  int n;
+  struct stat sb;
+  void *p;
+
+  fd = open(name, O_RDONLY|O_BINARY);
+  if (fd < 0) {
+    perror(name);
+    return 0;
+  }
+  if (fstat(fd, &sb) < 0) {
+    perror(name);
+    return 0;
+  }
+  if (!S_ISREG(sb.st_mode)) {
+    fprintf(stderr, "%s: not a regular file\n", name);
+    return 0;
+  }
+  nbytes = sb.st_size;
+  /* malloc will return NULL with nbytes == 0, handle files with size 0 */
+  if (nbytes == 0) {
+    static const char c = '\0';
+    processor(&c, 0, name, arg);
+    close(fd);
+    return 1;
+  }
+  p = malloc(nbytes);
+  if (!p) {
+    fprintf(stderr, "%s: out of memory\n", name);
+    close(fd);
+    return 0;
+  }
+  n = read(fd, p, nbytes);
+  if (n < 0) {
+    perror(name);
+    free(p);
+    close(fd);
+    return 0;
+  }
+  if (n != nbytes) {
+    fprintf(stderr, "%s: read unexpected number of bytes\n", name);
+    free(p);
+    close(fd);
+    return 0;
+  }
+  processor(p, nbytes, name, arg);
+  free(p);
+  close(fd);
+  return 1;
+}