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builtin-apply.c: mark common context lines in lineinfo structure.

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This updates the way preimage and postimage in a patch hunk is
parsed and prepared for applying.  By looking at image->line[n].flag,
the code can tell if it is a common context line that is the
same between the preimage and the postimage.

This matters when we actually start applying a patch with
contexts that have whitespace breakages that have already been
fixed in the target file.
This commit is contained in:
Junio C Hamano 2008-01-29 00:17:55 -08:00
parent ecf4c2ec6b
commit c330fdd42d
1 changed files with 32 additions and 25 deletions
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57
builtin-apply.c
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@ -170,6 +170,7 @@ struct line {
size_t len;
unsigned hash : 24;
unsigned flag : 8;
#define LINE_COMMON 1
};
/*
@ -179,6 +180,7 @@ struct image {
char *buf;
size_t len;
size_t nr;
size_t alloc;
struct line *line_allocated;
struct line *line;
};
@ -195,49 +197,39 @@ static uint32_t hash_line(const char *cp, size_t len)
return h;
}
static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
{
ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
img->line_allocated[img->nr].len = len;
img->line_allocated[img->nr].hash = hash_line(bol, len);
img->line_allocated[img->nr].flag = flag;
img->nr++;
}
static void prepare_image(struct image *image, char *buf, size_t len,
int prepare_linetable)
{
const char *cp, *ep;
int n;
memset(image, 0, sizeof(*image));
image->buf = buf;
image->len = len;
if (!prepare_linetable) {
image->line = NULL;
image->line_allocated = NULL;
image->nr = 0;
if (!prepare_linetable)
return;
}
ep = image->buf + image->len;
/* First count lines */
cp = image->buf;
n = 0;
while (cp < ep) {
cp = strchrnul(cp, '\n');
n++;
cp++;
}
image->line_allocated = xcalloc(n, sizeof(struct line));
image->line = image->line_allocated;
image->nr = n;
cp = image->buf;
n = 0;
while (cp < ep) {
const char *next;
for (next = cp; next < ep && *next != '\n'; next++)
;
if (next < ep)
next++;
image->line[n].len = next - cp;
image->line[n].hash = hash_line(cp, next - cp);
add_line_info(image, cp, next - cp, 0);
cp = next;
n++;
}
image->line = image->line_allocated;
}
static void clear_image(struct image *image)
@ -1822,6 +1814,9 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
struct image preimage;
struct image postimage;
memset(&preimage, 0, sizeof(preimage));
memset(&postimage, 0, sizeof(postimage));
while (size > 0) {
char first;
int len = linelen(patch, size);
@ -1857,10 +1852,14 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
break;
old[oldsize++] = '\n';
new[newsize++] = '\n';
add_line_info(&preimage, "\n", 1, LINE_COMMON);
add_line_info(&postimage, "\n", 1, LINE_COMMON);
break;
case ' ':
case '-':
memcpy(old + oldsize, patch + 1, plen);
add_line_info(&preimage, old + oldsize, plen,
(first == ' ' ? LINE_COMMON : 0));
oldsize += plen;
if (first == '-')
break;
@ -1869,6 +1868,9 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
if (first != '+' || !no_add) {
int added = apply_line(new + newsize, patch,
plen, ws_rule);
add_line_info(&postimage, new + newsize, added,
(first == '+' ? 0 : LINE_COMMON));
newsize += added;
if (first == '+' &&
added == 1 && new[newsize-1] == '\n')
@ -1921,8 +1923,13 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
}
pos = frag->newpos ? (frag->newpos - 1) : 0;
prepare_image(&preimage, oldlines, oldsize, 1);
prepare_image(&postimage, newlines, newsize, 1);
preimage.buf = old;
preimage.len = oldsize;
postimage.buf = new;
postimage.len = newsize;
preimage.line = preimage.line_allocated;
postimage.line = postimage.line_allocated;
for (;;) {
applied_pos = find_pos(img, &preimage, &postimage,