projects / unix-history / blame
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1 | /* |
| 2 | * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| c65fedcf | 4 | * |
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5 | * This code is derived from software contributed to Berkeley by |
| 6 | * Adam de Boor. | |
| c65fedcf | 7 | * |
| f15db449 | 8 | * %sccs.include.redist.c% |
| c65fedcf | 9 | */ |
| bb2109e7 | 10 | |
| c65fedcf | 11 | #ifndef lint |
| f15db449 | 12 | static char sccsid[] = "@(#)lstEnQueue.c 5.3 (Berkeley) %G%"; |
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13 | #endif /* not lint */ |
| 14 | ||
| 15 | /*- | |
| 16 | * LstEnQueue.c-- | |
| 17 | * Treat the list as a queue and place a datum at its end | |
| 18 | */ | |
| c65fedcf KB |
19 | |
| 20 | #include "lstInt.h" | |
| 21 | ||
| 22 | /*- | |
| 23 | *----------------------------------------------------------------------- | |
| 24 | * Lst_EnQueue -- | |
| 25 | * Add the datum to the tail of the given list. | |
| 26 | * | |
| 27 | * Results: | |
| 28 | * SUCCESS or FAILURE as returned by Lst_Append. | |
| 29 | * | |
| 30 | * Side Effects: | |
| 31 | * the lastPtr field is altered all the time and the firstPtr field | |
| 32 | * will be altered if the list used to be empty. | |
| 33 | * | |
| 34 | *----------------------------------------------------------------------- | |
| 35 | */ | |
| 36 | ReturnStatus | |
| 37 | Lst_EnQueue (l, d) | |
| 38 | Lst l; | |
| 39 | ClientData d; | |
| 40 | { | |
| 41 | if (LstValid (l) == FALSE) { | |
| 42 | return (FAILURE); | |
| 43 | } | |
| 44 | ||
| 45 | return (Lst_Append (l, Lst_Last(l), d)); | |
| 46 | } | |
| 47 |