Revision 12455,
852 bytes
checked in by danw, 26 years ago
(diff) |
This commit was generated by cvs2svn to compensate for changes in r12454,
which included commits to RCS files with non-trunk default branches.
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[12454] | 1 | |
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| 2 | /* |
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| 3 | * add.c -- If "s1" is NULL, this routine just creates a |
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| 4 | * -- copy of "s2" into newly malloc'ed memory. |
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| 5 | * -- |
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| 6 | * -- If "s1" is not NULL, then copy the concatenation |
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| 7 | * -- of "s1" and "s2" (note the order) into newly |
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| 8 | * -- malloc'ed memory. Then free "s1". |
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| 9 | * |
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| 10 | * $Id: add.c,v 1.1.1.1 1999-02-07 18:14:07 danw Exp $ |
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| 11 | */ |
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| 12 | |
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| 13 | #include <h/mh.h> |
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| 14 | |
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| 15 | char * |
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| 16 | add (char *s2, char *s1) |
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| 17 | { |
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| 18 | char *cp; |
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| 19 | size_t len1 = 0, len2 = 0; |
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| 20 | |
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| 21 | if (s1) |
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| 22 | len1 = strlen (s1); |
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| 23 | if (s2) |
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| 24 | len2 = strlen (s2); |
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| 25 | |
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| 26 | |
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| 27 | if (!(cp = malloc (len1 + len2 + 1))) |
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| 28 | adios (NULL, "unable to allocate string storage"); |
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| 29 | |
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| 30 | /* Copy s1 and free it */ |
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| 31 | if (s1) { |
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| 32 | memcpy (cp, s1, len1); |
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| 33 | free (s1); |
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| 34 | } |
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| 35 | |
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| 36 | /* Copy s2 */ |
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| 37 | if (s2) |
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| 38 | memcpy (cp + len1, s2, len2); |
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| 39 | |
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| 40 | /* Now NULL terminate the string */ |
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| 41 | cp[len1 + len2] = '\0'; |
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| 42 | |
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| 43 | return cp; |
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| 44 | } |
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