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#ifndef lint
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static const char RCSid[] = "$Id: savqstr.c,v 2.10 2012/06/01 19:17:17 greg Exp $";
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#endif
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/*
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* Save unshared strings.
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*
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* External symbols declared in standard.h
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*/
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#include "copyright.h"
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#include <stdlib.h>
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#include "rtio.h"
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#include "rterror.h"
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#if 1
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char *
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savqstr(char *s) /* save a private string */
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{
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char *cp;
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char *newp;
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if (s == NULL)
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return(NULL);
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if (!*s)
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return("");
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for (cp = s; *cp++; ) /* compute strlen()+1 */
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;
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newp = (char *)malloc(cp-s);
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if (newp == NULL) {
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eputs("out of memory in savqstr");
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quit(1);
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}
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for (cp = newp; (*cp++ = *s++); ) /* inline strcpy() */
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;
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return(newp); /* return new location */
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}
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void
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freeqstr(char *s) /* free a private string */
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{
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if (s != NULL && *s)
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free(s);
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}
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#else
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/*
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* Save unshared strings, packing them together into
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* large blocks to optimize paging in VM environments.
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*/
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#include "rtmisc.h"
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#ifdef SMLMEM
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#ifndef MINBLOCK
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#define MINBLOCK (1<<10) /* minimum allocation block size */
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#endif
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#ifndef MAXBLOCK
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#define MAXBLOCK (1<<14) /* maximum allocation block size */
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#endif
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#else
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#ifndef MINBLOCK
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#define MINBLOCK (1<<12) /* minimum allocation block size */
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#endif
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#ifndef MAXBLOCK
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#define MAXBLOCK (1<<16) /* maximum allocation block size */
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#endif
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#endif
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char *
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savqstr(char *s) /* save a private string */
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{
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static char *curp = NULL; /* allocated memory pointer */
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static unsigned nrem = 0; /* bytes remaining in block */
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static unsigned nextalloc = MINBLOCK; /* next block size */
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char *cp;
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unsigned n;
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if (s == NULL)
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return(NULL);
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if (!*s)
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return("");
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for (cp = s; *cp++; ) /* compute strlen()+1 */
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;
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if ((n = cp-s) > nrem) { /* do we need more core? */
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bfree(curp, nrem); /* free remnant */
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while (n > nextalloc)
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nextalloc <<= 1;
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if ((curp = (char *)bmalloc(nrem=nextalloc)) == NULL) {
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eputs("out of memory in savqstr");
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quit(1);
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}
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if ((nextalloc <<= 1) > MAXBLOCK) /* double block size */
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nextalloc = MAXBLOCK;
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}
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for (cp = curp; *cp++ = *s++; ) /* inline strcpy() */
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;
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s = curp; /* update allocation info. */
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curp = cp;
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nrem -= n;
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return(s); /* return new location */
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}
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void
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freeqstr(char *s) /* free a private string (not recommended) */
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{
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if (s != NULL && *s)
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bfree(s, strlen(s)+1);
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}
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#endif
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