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/* |
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/* Copyright 1988 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* savestr.c - routines for efficient string storage. |
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* |
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* Savestr(s) stores a shared read-only string. |
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static S_HEAD *stab[NHASH]; |
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#define hash(s) (shash(s)%NHASH) |
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extern char *savestr(), *strcpy(), *malloc(); |
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#define NULL 0 |
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if (str == NULL) |
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return(NULL); |
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hval = shash(str); |
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hval = hash(str); |
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for (sp = stab[hval]; sp != NULL; sp = sp->next) |
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if (!strcmp(str, string(sp))) { |
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sp->nl++; |
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if (s == NULL) |
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return; |
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hval = shash(s); |
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hval = hash(s); |
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for (spl = NULL, sp = stab[hval]; sp != NULL; spl = sp, sp = sp->next) |
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if (s == string(sp)) { |
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if (--sp->nl > 0) |
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int |
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strcmp(s1, s2) /* check for s1==s2 */ |
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register char *s1, *s2; |
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{ |
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if (s1 == s2) |
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return(0); |
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while (*s1 == *s2++) |
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if (!*s1++) |
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return(0); |
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return(*s1 - *--s2); |
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} |
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static int |
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shash(s) /* hash a string */ |
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shash(s) |
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register char *s; |
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{ |
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register int h = 0; |
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while (*s) |
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h += *s++; |
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return(h % NHASH); |
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h = (h<<1 & 0x7fff) ^ (*s++ & 0xff); |
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return(h); |
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} |
