tools(make): update make and cmake from esp-idf

Commit ID: 3450d9e5

tools/kconfig/expand_env.c

@@ -0,0 +1,88 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include <ctype.h>
+#include <stdbool.h>
+
+#include "expand_env.h"
+
+static bool allowed_env_var_name(char c)
+{
+  return c != '\0' &&
+    !isblank(c) &&
+    !iscntrl(c) &&
+    c != '/' &&
+    c != '\\' &&
+    c != '=' &&
+    c != '$';
+}
+
+#define MAX_LEN (128 * 1024) /* Longest a result can expand to */
+
+/* Very basic expansion that looks for variable references like $NAME and expands them
+ *
+ */
+char *expand_environment(const char *input, const char *src_name, int src_line_no)
+{
+  char *result = malloc(MAX_LEN);
+
+  char *out = result;
+  const char *in = input;
+
+  while (*in != '\0') {
+    // check for buffer overflow
+    if (out >= result + MAX_LEN - 1) {
+      goto too_long;
+    }
+
+    if (*in != '$') {
+      // not part of an environment variable name, copy directly
+      *out++ = *in++;
+      continue;
+    }
+
+    // *in points to start of an environment variable reference
+    in++;
+    const char *env_start = in;
+    while (allowed_env_var_name(*in)) { // scan to the end of the name
+      in++;
+    }
+    size_t env_len = in - env_start;
+
+    // make a buffer to hold the environment variable name
+    //
+    // strndup is not available on mingw32, apparently.
+    char *env_name = calloc(1, env_len + 1);
+    assert(env_name != NULL);
+    strncpy(env_name, env_start, env_len);
+
+    const char *value = getenv(env_name);
+    if (value == NULL || strlen(value) == 0) {
+      printf("%s:%d: undefined environment variable \"%s\"\n",
+             src_name, src_line_no, env_name);
+      exit(1);
+    }
+    free(env_name);
+    if (out + strlen(value) >= result + MAX_LEN - 1) {
+      goto too_long;
+    }
+    strcpy(out, value); // append the value to the result (range checked in previous statement)
+    out += strlen(value);
+  }
+
+  *out = '\0'; // null terminate the result string
+
+  return result;
+
+too_long:
+  printf("%s:%d: Expansion is longer than %d bytes\n",
+         src_name, src_line_no, MAX_LEN);
+  free(result);
+  exit(1);
+}
+
+void free_expanded(char *expanded)
+{
+  free(expanded);
+}