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Diffstat (limited to 'contrib/nvi/common/mem.h')
| -rw-r--r-- | contrib/nvi/common/mem.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/contrib/nvi/common/mem.h b/contrib/nvi/common/mem.h new file mode 100644 index 0000000..af42e6b --- /dev/null +++ b/contrib/nvi/common/mem.h @@ -0,0 +1,168 @@ +/*- + * Copyright (c) 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + * + * See the LICENSE file for redistribution information. + * + * @(#)mem.h 10.7 (Berkeley) 3/30/96 + */ + +/* Increase the size of a malloc'd buffer. Two versions, one that + * returns, one that jumps to an error label. + */ +#define BINC_GOTO(sp, lp, llen, nlen) { \ + void *L__bincp; \ + if ((nlen) > llen) { \ + if ((L__bincp = binc(sp, lp, &(llen), nlen)) == NULL) \ + goto alloc_err; \ + /* \ + * !!! \ + * Possible pointer conversion. \ + */ \ + lp = L__bincp; \ + } \ +} +#define BINC_RET(sp, lp, llen, nlen) { \ + void *L__bincp; \ + if ((nlen) > llen) { \ + if ((L__bincp = binc(sp, lp, &(llen), nlen)) == NULL) \ + return (1); \ + /* \ + * !!! \ + * Possible pointer conversion. \ + */ \ + lp = L__bincp; \ + } \ +} + +/* + * Get some temporary space, preferably from the global temporary buffer, + * from a malloc'd buffer otherwise. Two versions, one that returns, one + * that jumps to an error label. + */ +#define GET_SPACE_GOTO(sp, bp, blen, nlen) { \ + GS *L__gp = (sp) == NULL ? NULL : (sp)->gp; \ + if (L__gp == NULL || F_ISSET(L__gp, G_TMP_INUSE)) { \ + bp = NULL; \ + blen = 0; \ + BINC_GOTO(sp, bp, blen, nlen); \ + } else { \ + BINC_GOTO(sp, L__gp->tmp_bp, L__gp->tmp_blen, nlen); \ + bp = L__gp->tmp_bp; \ + blen = L__gp->tmp_blen; \ + F_SET(L__gp, G_TMP_INUSE); \ + } \ +} +#define GET_SPACE_RET(sp, bp, blen, nlen) { \ + GS *L__gp = (sp) == NULL ? NULL : (sp)->gp; \ + if (L__gp == NULL || F_ISSET(L__gp, G_TMP_INUSE)) { \ + bp = NULL; \ + blen = 0; \ + BINC_RET(sp, bp, blen, nlen); \ + } else { \ + BINC_RET(sp, L__gp->tmp_bp, L__gp->tmp_blen, nlen); \ + bp = L__gp->tmp_bp; \ + blen = L__gp->tmp_blen; \ + F_SET(L__gp, G_TMP_INUSE); \ + } \ +} + +/* + * Add space to a GET_SPACE returned buffer. Two versions, one that + * returns, one that jumps to an error label. + */ +#define ADD_SPACE_GOTO(sp, bp, blen, nlen) { \ + GS *L__gp = (sp) == NULL ? NULL : (sp)->gp; \ + if (L__gp == NULL || bp == L__gp->tmp_bp) { \ + F_CLR(L__gp, G_TMP_INUSE); \ + BINC_GOTO(sp, L__gp->tmp_bp, L__gp->tmp_blen, nlen); \ + bp = L__gp->tmp_bp; \ + blen = L__gp->tmp_blen; \ + F_SET(L__gp, G_TMP_INUSE); \ + } else \ + BINC_GOTO(sp, bp, blen, nlen); \ +} +#define ADD_SPACE_RET(sp, bp, blen, nlen) { \ + GS *L__gp = (sp) == NULL ? NULL : (sp)->gp; \ + if (L__gp == NULL || bp == L__gp->tmp_bp) { \ + F_CLR(L__gp, G_TMP_INUSE); \ + BINC_RET(sp, L__gp->tmp_bp, L__gp->tmp_blen, nlen); \ + bp = L__gp->tmp_bp; \ + blen = L__gp->tmp_blen; \ + F_SET(L__gp, G_TMP_INUSE); \ + } else \ + BINC_RET(sp, bp, blen, nlen); \ +} + +/* Free a GET_SPACE returned buffer. */ +#define FREE_SPACE(sp, bp, blen) { \ + GS *L__gp = (sp) == NULL ? NULL : (sp)->gp; \ + if (L__gp != NULL && bp == L__gp->tmp_bp) \ + F_CLR(L__gp, G_TMP_INUSE); \ + else \ + free(bp); \ +} + +/* + * Malloc a buffer, casting the return pointer. Various versions. + * + * !!! + * The cast should be unnecessary, malloc(3) and friends return void *'s, + * which is all we need. However, some systems that nvi needs to run on + * don't do it right yet, resulting in the compiler printing out roughly + * a million warnings. After awhile, it seemed easier to put the casts + * in instead of explaining it all the time. + */ +#define CALLOC(sp, p, cast, nmemb, size) { \ + if ((p = (cast)calloc(nmemb, size)) == NULL) \ + msgq(sp, M_SYSERR, NULL); \ +} +#define CALLOC_GOTO(sp, p, cast, nmemb, size) { \ + if ((p = (cast)calloc(nmemb, size)) == NULL) \ + goto alloc_err; \ +} +#define CALLOC_NOMSG(sp, p, cast, nmemb, size) { \ + p = (cast)calloc(nmemb, size); \ +} +#define CALLOC_RET(sp, p, cast, nmemb, size) { \ + if ((p = (cast)calloc(nmemb, size)) == NULL) { \ + msgq(sp, M_SYSERR, NULL); \ + return (1); \ + } \ +} + +#define MALLOC(sp, p, cast, size) { \ + if ((p = (cast)malloc(size)) == NULL) \ + msgq(sp, M_SYSERR, NULL); \ +} +#define MALLOC_GOTO(sp, p, cast, size) { \ + if ((p = (cast)malloc(size)) == NULL) \ + goto alloc_err; \ +} +#define MALLOC_NOMSG(sp, p, cast, size) { \ + p = (cast)malloc(size); \ +} +#define MALLOC_RET(sp, p, cast, size) { \ + if ((p = (cast)malloc(size)) == NULL) { \ + msgq(sp, M_SYSERR, NULL); \ + return (1); \ + } \ +} +/* + * XXX + * Don't depend on realloc(NULL, size) working. + */ +#define REALLOC(sp, p, cast, size) { \ + if ((p = (cast)(p == NULL ? \ + malloc(size) : realloc(p, size))) == NULL) \ + msgq(sp, M_SYSERR, NULL); \ +} + +/* + * Versions of memmove(3) and memset(3) that use the size of the + * initial pointer to figure out how much memory to manipulate. + */ +#define MEMMOVE(p, t, len) memmove(p, t, (len) * sizeof(*(p))) +#define MEMSET(p, value, len) memset(p, value, (len) * sizeof(*(p))) |
