Last change
on this file since 6099cac was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago |
Imported original source code.
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1 |
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2 | Environment Strings
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3 | Beckemeyer Development Tools
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4 |
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5 | ENV.O contains two functions from the UNIX (tm) run-time library.
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6 | It is provided at no extra cost to purchasers of MICRO C-Tools.
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7 |
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8 | The distribution diskette contains the C source file in the \SRC
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9 | directory.
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10 |
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11 | Descriptions of the two functions follow:
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12 |
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13 | Getenv
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14 | ------
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15 | char *getenv(name)
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16 | char *name; /* name of environment variable */
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17 |
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18 | The getenv function searches the envronment table for the given
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19 | variable. It returns a pointer the value of the variable, or
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20 | a NULL pointer if the variable cannot be found.
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21 |
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22 |
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23 | Putenv
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24 | ------
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25 | int putenv(string)
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26 | char *string;
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27 |
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28 | The putenv function adds a new environment variable or modifies an
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29 | existing one. String must be a pointer to a string of the form:
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30 |
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31 | name=value
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32 |
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33 | where name is the name of the environment variable to add or modify,
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34 | and value is the value to assign to that variable.
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35 |
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36 | Putenv returns 0 if it is successfull. A return value of -1 indicates
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37 | an error.
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38 |
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39 |
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40 | IMPORTANT NOTES
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41 | ---------------
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42 |
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43 | You cannot modify the environment directly. Always use the putenv
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44 | function to add or change environment variables. To change the
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45 | value of the string returned by getenv without affecting the
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46 | environment, use strcpy to make a copy of the string.
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47 |
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48 |
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