Last change
on this file since 06f6615 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago |
Imported original source code.
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File size:
951 bytes
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1 | /*
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2 | =============================================================================
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3 | strrevi.c -- reverse a string in place
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4 | Version 1 -- 1988-02-03 -- D.N. Lynx Crowe
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5 |
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6 | char *
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7 | strrevi(s)
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8 | char *s;
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9 |
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10 | Reverses string 's1' in place. Returns 's1'.
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11 | =============================================================================
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12 | */
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13 |
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14 | char *
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15 | strrevi(s)
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16 | char *s;
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17 | {
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18 | register char *p1, *p2;
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19 | register long i;
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20 | register char c;
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21 |
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22 | p1 = s; /* initialize left end pointer */
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23 | p2 = s; /* initialize right end pointer */
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24 | i = 0L; /* initialize character count */
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25 |
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26 | while (*p2) { /* find the right end of the string */
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27 |
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28 | ++i;
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29 | ++p2;
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30 | }
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31 |
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32 | --p2; /* adjust right end pointer */
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33 | i >>= 1; /* calculate swap count */
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34 |
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35 | while (i--) { /* for each pair of characters ... */
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36 |
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37 | c = *p2; /* ... swap right and left characters */
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38 | *p2-- = *p1;
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39 | *p1++ = c;
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40 | }
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41 |
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42 | return(s); /* return pointer to reversed string */
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43 | }
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