| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) Michael Haardt 2015 |
| 6 | * Copyright (c) Jeremy Harris 2015 - 2016 |
| 7 | * Copyright (c) The Exim Maintainers 2016 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | /* This module provides (un)setenv routines for those environments |
| 11 | lacking them in libraries. It is #include'd by OS/os.c-foo files. */ |
| 12 | |
| 13 | |
| 14 | int |
| 15 | setenv(const char * name, const char * val, int overwrite) |
| 16 | { |
| 17 | uschar * s; |
| 18 | if (Ustrchr(name, '=')) return -1; |
| 19 | if (overwrite || !getenv(name)) |
| 20 | putenv(CS string_copy_malloc(string_sprintf("%s=%s", name, val))); |
| 21 | return 0; |
| 22 | } |
| 23 | |
| 24 | int |
| 25 | unsetenv(const char *name) |
| 26 | { |
| 27 | size_t len; |
| 28 | const char * end; |
| 29 | char ** e; |
| 30 | extern char ** environ; |
| 31 | |
| 32 | if (!name) |
| 33 | { |
| 34 | errno = EINVAL; |
| 35 | return -1; |
| 36 | } |
| 37 | |
| 38 | if (!environ) |
| 39 | return 0; |
| 40 | |
| 41 | for (end = name; *end != '=' && *end; ) end++; |
| 42 | len = end - name; |
| 43 | |
| 44 | /* Find name in environment and move remaining variables down. |
| 45 | Do not early-out in case there are duplicate names. */ |
| 46 | |
| 47 | for (e = environ; *e; e++) |
| 48 | if (strncmp(*e, name, len) == 0 && (*e)[len] == '=') |
| 49 | { |
| 50 | char ** sp = e; |
| 51 | do *sp = sp[1]; while (*++sp); |
| 52 | } |
| 53 | |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | /* vi: aw ai sw=2 |
| 58 | */ |
| 59 | /* End of setenv.c */ |