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* Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#include <sys/types.h>
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#endif /* STDC_HEADERS */
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#endif /* HAVE_STRING_H */
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#endif /* HAVE_STRINGS_H */
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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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setenv(const char *var, const char *val, int overwrite)
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if (!var || *var == '\0') {
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* POSIX says a var name with '=' is an error but BSD
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* just ignores the '=' and anything after it.
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for (src = var; *src != '\0' && *src != '='; src++)
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esize = (size_t)(src - var) + 2;
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esize += strlen(val); /* glibc treats a NULL val as "" */
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/* Allocate and fill in envstr. */
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if ((envstr = malloc(esize)) == NULL)
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for (src = var, dst = envstr; *src != '\0' && *src != '=';)
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for (src = val; *src != '\0';)
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if (!overwrite && getenv(var) != NULL) {
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return putenv(envstr);