src/common/savqstr.c

#ifndef lint
static const char RCSid[] = "$Id: savqstr.c,v 2.10 2012/06/01 19:17:17 greg Exp $";
#endif
/*
 *  Save unshared strings.
 *
 *  External symbols declared in standard.h
 */

#include "copyright.h"

#include <stdlib.h>

#include "rtio.h"
#include "rterror.h"


#if 1

char *
savqstr(char *s)                        /* save a private string */
{
        char  *cp;
        char  *newp;

        if (s == NULL)
                return(NULL);
        if (!*s)
                return("");
        for (cp = s; *cp++; )                   /* compute strlen()+1 */
                ;
        newp = (char *)malloc(cp-s);
        if (newp == NULL) {
                eputs("out of memory in savqstr");
                quit(1);
        }
        for (cp = newp; (*cp++ = *s++); )       /* inline strcpy() */
                ;
        return(newp);                           /* return new location */
}


void
freeqstr(char *s)                       /* free a private string */
{
        if (s != NULL && *s)
                free(s);
}

#else

/*
 *  Save unshared strings, packing them together into
 *  large blocks to optimize paging in VM environments.
 */

#include "rtmisc.h"

#ifdef  SMLMEM
#ifndef  MINBLOCK
#define  MINBLOCK       (1<<10)         /* minimum allocation block size */
#endif
#ifndef  MAXBLOCK
#define  MAXBLOCK       (1<<14)         /* maximum allocation block size */
#endif
#else
#ifndef  MINBLOCK
#define  MINBLOCK       (1<<12)         /* minimum allocation block size */
#endif
#ifndef  MAXBLOCK
#define  MAXBLOCK       (1<<16)         /* maximum allocation block size */
#endif
#endif


char *
savqstr(char *s)                        /* save a private string */
{
        static char  *curp = NULL;              /* allocated memory pointer */
        static unsigned  nrem = 0;              /* bytes remaining in block */
        static unsigned  nextalloc = MINBLOCK;  /* next block size */
        char  *cp;
        unsigned  n;

        if (s == NULL)
                return(NULL);
        if (!*s)
                return("");
        for (cp = s; *cp++; )                   /* compute strlen()+1 */
                ;
        if ((n = cp-s) > nrem) {                /* do we need more core? */
                bfree(curp, nrem);                      /* free remnant */
                while (n > nextalloc)
                        nextalloc <<= 1;
                if ((curp = (char *)bmalloc(nrem=nextalloc)) == NULL) {
                        eputs("out of memory in savqstr");
                        quit(1);
                }
                if ((nextalloc <<= 1) > MAXBLOCK)       /* double block size */
                        nextalloc = MAXBLOCK;
        }
        for (cp = curp; *cp++ = *s++; )         /* inline strcpy() */
                ;
        s = curp;                               /* update allocation info. */
        curp = cp;
        nrem -= n;
        return(s);                              /* return new location */
}


void
freeqstr(char *s)               /* free a private string (not recommended) */
{
        if (s != NULL && *s)
                bfree(s, strlen(s)+1);
}

#endif
Revision:	2.11
Committed:	Tue Feb 1 18:43:26 2022 UTC (2 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R4, HEAD
Changes since 2.10:	+15 -6 lines
Log Message:	perf: Added check for NULL and empty string
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.11	static const char RCSid[] = "$Id: savqstr.c,v 2.10 2012/06/01 19:17:17 greg Exp $";
3	greg	1.1	#endif
4	greg	2.3	/*
5			* Save unshared strings.
6			*
7			* External symbols declared in standard.h
8			*/
9
10	greg	2.4	#include "copyright.h"
11	greg	2.3
12			#include <stdlib.h>
13
14	schorsch	2.9	#include "rtio.h"
15	schorsch	2.7	#include "rterror.h"
16
17	greg	2.3
18			#if 1
19
20			char *
21	greg	2.10	savqstr(char s) / save a private string */
22	greg	2.3	{
23	greg	2.10	char *cp;
24	greg	2.3	char *newp;
25
26	greg	2.11	if (s == NULL)
27			return(NULL);
28			if (!*s)
29			return("");
30	greg	2.3	for (cp = s; cp++; ) / compute strlen()+1 */
31			;
32			newp = (char *)malloc(cp-s);
33			if (newp == NULL) {
34			eputs("out of memory in savqstr");
35			quit(1);
36			}
37	greg	2.11	for (cp = newp; (cp++ = s++); ) /* inline strcpy() */
38	greg	2.3	;
39			return(newp); /* return new location */
40			}
41
42
43			void
44	greg	2.10	freeqstr(char s) / free a private string */
45	greg	2.3	{
46	greg	2.11	if (s != NULL && *s)
47			free(s);
48	greg	2.3	}
49
50			#else
51	greg	1.1
52			/*
53	greg	2.2	* Save unshared strings, packing them together into
54			* large blocks to optimize paging in VM environments.
55	greg	1.1	*/
56
57	greg	2.10	#include "rtmisc.h"
58
59	greg	2.6	#ifdef SMLMEM
60	greg	2.2	#ifndef MINBLOCK
61	greg	2.6	#define MINBLOCK (1<<10) /* minimum allocation block size */
62	greg	2.2	#endif
63			#ifndef MAXBLOCK
64	greg	2.6	#define MAXBLOCK (1<<14) /* maximum allocation block size */
65	greg	2.2	#endif
66			#else
67			#ifndef MINBLOCK
68	greg	2.6	#define MINBLOCK (1<<12) /* minimum allocation block size */
69	greg	2.2	#endif
70			#ifndef MAXBLOCK
71	greg	2.6	#define MAXBLOCK (1<<16) /* maximum allocation block size */
72	greg	2.2	#endif
73			#endif
74	greg	1.1
75	greg	2.2
76	greg	1.1	char *
77	greg	2.10	savqstr(char s) / save a private string */
78	greg	1.1	{
79	greg	2.2	static char curp = NULL; / allocated memory pointer */
80			static unsigned nrem = 0; /* bytes remaining in block */
81			static unsigned nextalloc = MINBLOCK; /* next block size */
82	greg	2.10	char *cp;
83			unsigned n;
84	greg	1.1
85	greg	2.11	if (s == NULL)
86			return(NULL);
87			if (!*s)
88			return("");
89	greg	2.2	for (cp = s; cp++; ) / compute strlen()+1 */
90			;
91			if ((n = cp-s) > nrem) { /* do we need more core? */
92			bfree(curp, nrem); /* free remnant */
93			while (n > nextalloc)
94			nextalloc <<= 1;
95	greg	2.11	if ((curp = (char *)bmalloc(nrem=nextalloc)) == NULL) {
96	greg	2.2	eputs("out of memory in savqstr");
97			quit(1);
98			}
99			if ((nextalloc <<= 1) > MAXBLOCK) /* double block size */
100			nextalloc = MAXBLOCK;
101	greg	1.1	}
102	greg	2.2	for (cp = curp; cp++ = s++; ) /* inline strcpy() */
103			;
104			s = curp; /* update allocation info. */
105			curp = cp;
106			nrem -= n;
107			return(s); /* return new location */
108	greg	1.1	}
109
110
111	greg	2.3	void
112	greg	2.10	freeqstr(char s) / free a private string (not recommended) */
113	greg	1.1	{
114	greg	2.11	if (s != NULL && *s)
115			bfree(s, strlen(s)+1);
116	greg	1.1	}
117	greg	2.3
118			#endif