/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ¡
â Copyright 2022 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/dce.h"
#include "libc/intrin/_getenv.internal.h"

#define ToUpper(c) \
  (IsWindows() && (c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))

struct Env _getenv(char **p, const char *k) {
  char *t;
  int i, j;
  for (i = 0; (t = p[i]); ++i) {
    for (j = 0;; ++j) {
      if (!k[j] || k[j] == '=') {
        if (!t[j]) return (struct Env){t + j, i};
        if (t[j] == '=') return (struct Env){t + j + 1, i};
        break;
      }
      if (ToUpper(k[j] & 255) != ToUpper(t[j] & 255)) {
        break;
      }
    }
  }
  return (struct Env){0, i};
}
