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#ifndef lint |
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static const char RCSid[] = "$Id: savqstr.c,v 2.11 2022/02/01 18:43:26 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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|
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#include "copyright.h" |
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|
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#include <stdlib.h> |
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|
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#include "rtio.h" |
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#include "rterror.h" |
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|
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|
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#if 1 |
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|
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char * |
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savqstr(const 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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|
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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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|
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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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|
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#else |
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|
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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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|
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#include "rtmisc.h" |
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|
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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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|
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|
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char * |
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savqstr(const 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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|
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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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|
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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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|
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#endif |
