diffreg.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 1,111 行 · 第 1/2 页

					} while(isspace(d=getc(input[1])));
				} else if ( wflag ) {
					while( isspace(c) && c!='\n' ) {
						c=getc(input[0]);
						ctold++;
					}
					while( isspace(d) && d!='\n' ) {
						d=getc(input[1]);
						ctnew++;
					}
				}
				if(chrtran[c] != chrtran[d]) {
					jackpot++;
					J[i] = 0;
					if(c!='\n')
						ctold += skipline(0);
					if(d!='\n')
						ctnew += skipline(1);
					break;
				}
				if(c=='\n')
					break;
			}
		} else {
			for(;;) {
				ctold++;
				ctnew++;
				if((c=getc(input[0])) != (d=getc(input[1]))) {
					/* jackpot++; */
					J[i] = 0;
					if(c!='\n')
						ctold += skipline(0);
					if(d!='\n')
						ctnew += skipline(1);
					break;
				}
				if(c=='\n')
					break;
			}
		}
		ixold[i] = ctold;
		ixnew[j] = ctnew;
		j++;
	}
	for(;j<=len[1];j++) {
		ixnew[j] = ctnew += skipline(1);
	}
	fclose(input[0]);
	fclose(input[1]);
/*
	if(jackpot)
		fprintf(stderr, "jackpot\n");
*/
}

sort(a,n)	/*shellsort CACM #201*/
struct line *a;
{
	register struct line w;
	register int j,m;
	register struct line *ai;
	register struct line *aim;
	int k;

	if (n == 0)
		return;
	for(j=1;j<=n;j*= 2)
		m = 2*j - 1;
	for(m/=2;m!=0;m/=2) {
		k = n-m;
		for(j=1;j<=k;j++) {
			for(ai = &a[j]; ai > a; ai -= m) {
				aim = &ai[m];
				if(aim < ai)
					break;	/*wraparound*/
				if(aim->value > ai->value ||
				   aim->value == ai->value &&
				   aim->serial > ai->serial)
					break;
				w    = *ai;
				*ai  = *aim;
				*aim = w;
			}
		}
	}
}

unsort(f, l, b)
struct line *f;
int *b;
{
	register int *a;
	register int i;
	a = (int *)talloc((l+1)*sizeof(int));
	for(i=1;i<=l;i++)
		a[f[i].serial] = f[i].value;
	for(i=1;i<=l;i++)
		b[i] = a[i];
	free((char *)a);
}

skipline(f)
{
	register i, c;

	for(i=1;(c=getc(input[f]))!='\n';i++)
		if (c < 0)
			return(i);
	return(i);
}

output()
{
	int m;
	register int i0, i1, j1;
	int j0;
	input[0] = fopen(file1,"r");
	input[1] = fopen(file2,"r");
	m = len[0];
	J[0] = 0;
	J[m+1] = len[1]+1;
	if(opt!=D_EDIT) for(i0=1;i0<=m;i0=i1+1) {
		while(i0<=m&&J[i0]==J[i0-1]+1) i0++;
		j0 = J[i0-1]+1;
		i1 = i0-1;
		while(i1<m&&J[i1+1]==0) i1++;
		j1 = J[i1+1]-1;
		J[i1] = j1;
		change(i0,i1,j0,j1);
	} else for(i0=m;i0>=1;i0=i1-1) {
		while(i0>=1&&J[i0]==J[i0+1]-1&&J[i0]!=0) i0--;
		j0 = J[i0+1]-1;
		i1 = i0+1;
		while(i1>1&&J[i1-1]==0) i1--;
		j1 = J[i1-1]+1;
		J[i1] = j1;
		change(i1,i0,j1,j0);
	}
	if(m==0)
		change(1,0,1,len[1]);
	if (opt==D_IFDEF) {
		for (;;) {
#define	c i0
			c = getc(input[0]);
			if (c < 0)
				return;
			putchar(c);
		}
#undef c
	}
	if (anychange && opt == D_CONTEXT)
		dump_context_vec();
}

/*
 * The following struct is used to record change information when
 * doing a "context" diff.  (see routine "change" to understand the
 * highly mneumonic field names)
 */
struct context_vec {
	int	a;	/* start line in old file */
	int	b;	/* end line in old file */
	int	c;	/* start line in new file */
	int	d;	/* end line in new file */
};

struct	context_vec	*context_vec_start,
			*context_vec_end,
			*context_vec_ptr;

#define	MAX_CONTEXT	128

/* indicate that there is a difference between lines a and b of the from file
   to get to lines c to d of the to file.
   If a is greater then b then there are no lines in the from file involved
   and this means that there were lines appended (beginning at b).
   If c is greater than d then there are lines missing from the to file.
*/
change(a,b,c,d)
{
	int ch;
	int lowa,upb,lowc,upd;
	struct stat stbuf;

	if (opt != D_IFDEF && a>b && c>d)
		return;
	if (anychange == 0) {
		anychange = 1;
		if(opt == D_CONTEXT) {
			printf("*** %s	", file1);
			stat(file1, &stbuf);
			printf("%s--- %s	",
			    ctime(&stbuf.st_mtime), file2);
			stat(file2, &stbuf);
			printf("%s", ctime(&stbuf.st_mtime));

			context_vec_start = (struct context_vec *) 
						malloc(MAX_CONTEXT *
						   sizeof(struct context_vec));
			context_vec_end = context_vec_start + MAX_CONTEXT;
			context_vec_ptr = context_vec_start - 1;
		}
	}
	if (a <= b && c <= d)
		ch = 'c';
	else
		ch = (a <= b) ? 'd' : 'a';
	if(opt == D_CONTEXT) {
		/*
		 * if this new change is within 'context' lines of
		 * the previous change, just add it to the change
		 * record.  If the record is full or if this
		 * change is more than 'context' lines from the previous
		 * change, dump the record, reset it & add the new change.
		 */
		if ( context_vec_ptr >= context_vec_end ||
		     ( context_vec_ptr >= context_vec_start &&
		       a > (context_vec_ptr->b + 2*context) &&
		       c > (context_vec_ptr->d + 2*context) ) )
			dump_context_vec();

		context_vec_ptr++;
		context_vec_ptr->a = a;
		context_vec_ptr->b = b;
		context_vec_ptr->c = c;
		context_vec_ptr->d = d;
		return;
	}
	switch (opt) {

	case D_NORMAL:
	case D_EDIT:
		range(a,b,",");
		putchar(a>b?'a':c>d?'d':'c');
		if(opt==D_NORMAL)
			range(c,d,",");
		putchar('\n');
		break;
	case D_REVERSE:
		putchar(a>b?'a':c>d?'d':'c');
		range(a,b," ");
		putchar('\n');
		break;
        case D_NREVERSE:
                if (a>b)
                        printf("a%d %d\n",b,d-c+1);
                else {
                        printf("d%d %d\n",a,b-a+1);
                        if (!(c>d))
                           /* add changed lines */
                           printf("a%d %d\n",b, d-c+1);
                }
                break;
	}
	if(opt == D_NORMAL || opt == D_IFDEF) {
		fetch(ixold,a,b,input[0],"< ", 1);
		if(a<=b&&c<=d && opt == D_NORMAL)
			prints("---\n");
	}
	fetch(ixnew,c,d,input[1],opt==D_NORMAL?"> ":"", 0);
	if ((opt ==D_EDIT || opt == D_REVERSE) && c<=d)
		prints(".\n");
	if (inifdef) {
		fprintf(stdout, "#endif %s\n", endifname);
		inifdef = 0;
	}
}

range(a,b,separator)
char *separator;
{
	printf("%d", a>b?b:a);
	if(a<b) {
		printf("%s%d", separator, b);
	}
}

fetch(f,a,b,lb,s,oldfile)
long *f;
FILE *lb;
char *s;
{
	register int i, j;
	register int c;
	register int col;
	register int nc;
	int oneflag = (*ifdef1!='\0') != (*ifdef2!='\0');

	/*
	 * When doing #ifdef's, copy down to current line
	 * if this is the first file, so that stuff makes it to output.
	 */
	if (opt == D_IFDEF && oldfile){
		long curpos = ftell(lb);
		/* print through if append (a>b), else to (nb: 0 vs 1 orig) */
		nc = f[a>b? b : a-1 ] - curpos;
		for (i = 0; i < nc; i++)
			putchar(getc(lb));
	}
	if (a > b)
		return;
	if (opt == D_IFDEF) {
		if (inifdef)
			fprintf(stdout, "#else %s%s\n", oneflag && oldfile==1 ? "!" : "", ifdef2);
		else {
			if (oneflag) {
				/* There was only one ifdef given */
				endifname = ifdef2;
				if (oldfile)
					fprintf(stdout, "#ifndef %s\n", endifname);
				else
					fprintf(stdout, "#ifdef %s\n", endifname);
			}
			else {
				endifname = oldfile ? ifdef1 : ifdef2;
				fprintf(stdout, "#ifdef %s\n", endifname);
			}
		}
		inifdef = 1+oldfile;
	}

	for(i=a;i<=b;i++) {
		fseek(lb,f[i-1],0);
		nc = f[i]-f[i-1];
		if (opt != D_IFDEF)
			prints(s);
		col = 0;
		for(j=0;j<nc;j++) {
			c = getc(lb);
			if (c == '\t' && tflag)
				do
					putchar(' ');
				while (++col & 7);
			else {
				putchar(c);
				col++;
			}
		}
	}

	if (inifdef && !wantelses) {
		fprintf(stdout, "#endif %s\n", endifname);
		inifdef = 0;
	}
}

#define POW2			/* define only if HALFLONG is 2**n */
#define HALFLONG 16
#define low(x)	(x&((1L<<HALFLONG)-1))
#define high(x)	(x>>HALFLONG)

/*
 * hashing has the effect of
 * arranging line in 7-bit bytes and then
 * summing 1-s complement in 16-bit hunks 
 */
readhash(f)
register FILE *f;
{
	register long sum;
	register unsigned shift;
	register t;
	register space;

	sum = 1;
	space = 0;
	if(!bflag && !wflag) {
		if(iflag)
			for(shift=0;(t=getc(f))!='\n';shift+=7) {
				if(t==-1)
					return(0);
				sum += (long)chrtran[t] << (shift
#ifdef POW2
				    &= HALFLONG - 1);
#else
				    %= HALFLONG);
#endif
			}
		else
			for(shift=0;(t=getc(f))!='\n';shift+=7) {
				if(t==-1)
					return(0);
				sum += (long)t << (shift
#ifdef POW2
				    &= HALFLONG - 1);
#else
				    %= HALFLONG);
#endif
			}
	} else {
		for(shift=0;;) {
			switch(t=getc(f)) {
			case -1:
				return(0);
			case '\t':
			case ' ':
				space++;
				continue;
			default:
				if(space && !wflag) {
					shift += 7;
					space = 0;
				}
				sum += (long)chrtran[t] << (shift
#ifdef POW2
				    &= HALFLONG - 1);
#else
				    %= HALFLONG);
#endif
				shift += 7;
				continue;
			case '\n':
				break;
			}
			break;
		}
	}
	sum = low(sum) + high(sum);
	return((short)low(sum) + (short)high(sum));
}

#include <a.out.h>

asciifile(f)
	FILE *f;
{
	char buf[BUFSIZ];
	register int cnt, c;
	register char *cp;

	fseek(f, (long)0, 0);
	cnt = fread(buf, 1, BUFSIZ, f);

#ifdef mips
	if (cnt >= FILHSZ + AOUTHSZ) {
		AOUTHDR hdr;
		hdr = *(AOUTHDR *)&buf[FILHSZ];
		if (!N_BADMAG(hdr))
			return (0);
	}
#else
	if (cnt >= sizeof (struct exec)) {
		struct exec hdr;
		hdr = *(struct exec *)buf;
		if (!N_BADMAG(hdr))
			return (0);
	}
#endif mips

	cp = buf;
	while (--cnt >= 0)
	{	
		c = *cp++ & 0377;
		if (!(c & 0200))
			continue;
		if (ismulti(c))
			continue;
		return (0);
	}
	return (1);
}


/* dump accumulated "context" diff changes */
dump_context_vec()
{
	register int	a, b, c, d;
	register char	ch;
	register struct	context_vec *cvp = context_vec_start;
	register int	lowa, upb, lowc, upd;
	register int	do_output;

	if ( cvp > context_vec_ptr )
		return;

	lowa = max(1, cvp->a - context);
	upb  = min(len[0], context_vec_ptr->b + context);
	lowc = max(1, cvp->c - context);
	upd  = min(len[1], context_vec_ptr->d + context);

	printf("***************\n*** ");
	range(lowa,upb,",");
	printf(" ****\n");

	/*
	 * output changes to the "old" file.  The first loop suppresses
	 * output if there were no changes to the "old" file (we'll see
	 * the "old" lines as context in the "new" list).
	 */
	do_output = 0;
	for ( ; cvp <= context_vec_ptr; cvp++)
		if (cvp->a <= cvp->b) {
			cvp = context_vec_start;
			do_output++;
			break;
		}
	
	if ( do_output ) {
		while (cvp <= context_vec_ptr) {
			a = cvp->a; b = cvp->b; c = cvp->c; d = cvp->d;

			if (a <= b && c <= d)
				ch = 'c';
			else
				ch = (a <= b) ? 'd' : 'a';

			if (ch == 'a')
				fetch(ixold,lowa,b,input[0],"  ");
			else {
				fetch(ixold,lowa,a-1,input[0],"  ");
				fetch(ixold,a,b,input[0],ch == 'c' ? "! " : "- ");
			}
			lowa = b + 1;
			cvp++;
		}
		fetch(ixold, b+1, upb, input[0], "  ");
	}

	/* output changes to the "new" file */
	printf("--- ");
	range(lowc,upd,",");
	printf(" ----\n");

	do_output = 0;
	for (cvp = context_vec_start; cvp <= context_vec_ptr; cvp++)
		if (cvp->c <= cvp->d) {
			cvp = context_vec_start;
			do_output++;
			break;
		}
	
	if (do_output) {
		while (cvp <= context_vec_ptr) {
			a = cvp->a; b = cvp->b; c = cvp->c; d = cvp->d;

			if (a <= b && c <= d)
				ch = 'c';
			else
				ch = (a <= b) ? 'd' : 'a';

			if (ch == 'd')
				fetch(ixnew,lowc,d,input[1],"  ");
			else {
				fetch(ixnew,lowc,c-1,input[1],"  ");
				fetch(ixnew,c,d,input[1],ch == 'c' ? "! " : "+ ");
			}
			lowc = d + 1;
			cvp++;
		}
		fetch(ixnew, d+1, upd, input[1], "  ");
	}

	context_vec_ptr = context_vec_start - 1;
}