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diff: fix bug 613 (diff -ub segfaults)

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function                                             old     new   delta
dump_unified_vec                                     435     457     +22
diff_main                                            855     860      +5
diffreg                                             1786    1781      -5
do_diff                                              428     416     -12
change                                               325     283     -42
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/3 up/down: 27/-59)            Total: -32 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-09-21 01:22:18 +02:00
parent 532609e36e
commit 3e02050314
1 changed files with 25 additions and 38 deletions
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63
editors/diff.c
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@ -102,7 +102,7 @@ struct globals {
bool anychange;
smallint exit_status;
int opt_U_context;
size_t max_context; /* size of context_vec_start */
int context_idx;
IF_FEATURE_DIFF_DIR(int dl_count;)
IF_FEATURE_DIFF_DIR(char **dl;)
char *opt_S_start;
@ -119,9 +119,7 @@ struct globals {
long *ixold; /* will be overlaid on klist */
struct line *nfile[2];
struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
struct context_vec *context_vec_start;
struct context_vec *context_vec_end;
struct context_vec *context_vec_ptr;
struct context_vec *context_vector;
char *tempname1, *tempname2;
struct stat stb1, stb2;
};
@ -129,7 +127,7 @@ struct globals {
#define anychange (G.anychange )
#define exit_status (G.exit_status )
#define opt_U_context (G.opt_U_context )
#define max_context (G.max_context )
#define context_idx (G.context_idx )
#define dl_count (G.dl_count )
#define dl (G.dl )
#define opt_S_start (G.opt_S_start )
@ -147,9 +145,7 @@ struct globals {
#define ixold (G.ixold )
#define nfile (G.nfile )
#define sfile (G.sfile )
#define context_vec_start (G.context_vec_start )
#define context_vec_end (G.context_vec_end )
#define context_vec_ptr (G.context_vec_ptr )
#define context_vector (G.context_vector )
#define stb1 (G.stb1 )
#define stb2 (G.stb2 )
#define tempname1 (G.tempname1 )
@ -157,7 +153,7 @@ struct globals {
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
opt_U_context = 3; \
max_context = 64; \
context_vector = xrealloc_vector(context_vector, 6, 0); \
} while (0)
@ -230,11 +226,10 @@ static ALWAYS_INLINE int fiddle_sum(int sum, int t)
}
static int readhash(FILE *fp)
{
int i, t, space;
int i, t;
int sum;
sum = 1;
space = 0;
i = 0;
if (!(option_mask32 & (FLAG_b | FLAG_w))) {
while ((t = getc(fp)) != '\n') {
@ -247,8 +242,11 @@ static int readhash(FILE *fp)
i = 1;
}
} else {
int space = 0;
while (1) {
switch (t = getc(fp)) {
t = getc(fp);
switch (t) {
case '\t':
case '\r':
case '\v':
@ -763,19 +761,19 @@ static int asciifile(FILE *f)
/* dump accumulated "unified" diff changes */
static void dump_unified_vec(FILE *f1, FILE *f2)
{
struct context_vec *cvp = context_vec_start;
struct context_vec *cvp = context_vector;
int lowa, upb, lowc, upd;
int a, b, c, d;
char ch;
if (context_vec_start > context_vec_ptr)
if (context_idx < 0)
return;
b = d = 0; /* gcc */
lowa = MAX(1, cvp->a - opt_U_context);
upb = MIN(nlen[0], context_vec_ptr->b + opt_U_context);
upb = MIN(nlen[0], context_vector[context_idx].b + opt_U_context);
lowc = MAX(1, cvp->c - opt_U_context);
upd = MIN(nlen[1], context_vec_ptr->d + opt_U_context);
upd = MIN(nlen[1], context_vector[context_idx].d + opt_U_context);
printf("@@ -");
uni_range(lowa, upb);
@ -787,7 +785,7 @@ static void dump_unified_vec(FILE *f1, FILE *f2)
* Output changes in "unified" diff format--the old and new lines
* are printed together.
*/
for (; cvp <= context_vec_ptr; cvp++) {
for (; cvp <= &context_vector[context_idx]; cvp++) {
a = cvp->a;
b = cvp->b;
c = cvp->c;
@ -834,7 +832,7 @@ static void dump_unified_vec(FILE *f1, FILE *f2)
}
fetch(ixnew, d + 1, upd, f2, ' ');
context_vec_ptr = context_vec_start - 1;
context_idx = -1;
}
@ -866,25 +864,13 @@ static void change(const char *file1, FILE *f1, const char *file2, FILE *f2,
return;
}
/*
* Allocate change records as needed.
*/
if (context_vec_ptr == context_vec_end - 1) {
ptrdiff_t offset = context_vec_ptr - context_vec_start;
max_context <<= 1;
context_vec_start = xrealloc(context_vec_start,
max_context * sizeof(struct context_vec));
context_vec_end = context_vec_start + max_context;
context_vec_ptr = context_vec_start + offset;
}
if (anychange == 0) {
/*
* Print the context/unidiff header first time through.
*/
print_header(file1, file2);
} else if (a > context_vec_ptr->b + (2 * opt_U_context) + 1
&& c > context_vec_ptr->d + (2 * opt_U_context) + 1
} else if (a > context_vector[context_idx].b + (2 * opt_U_context) + 1
&& c > context_vector[context_idx].d + (2 * opt_U_context) + 1
) {
/*
* If this change is more than 'context' lines from the
@ -893,11 +879,12 @@ static void change(const char *file1, FILE *f1, const char *file2, FILE *f2,
// dump_unified_vec() seeks!
dump_unified_vec(f1, f2);
}
context_vec_ptr++;
context_vec_ptr->a = a;
context_vec_ptr->b = b;
context_vec_ptr->c = c;
context_vec_ptr->d = d;
context_idx++;
context_vector = xrealloc_vector(context_vector, 6, context_idx);
context_vector[context_idx].a = a;
context_vector[context_idx].b = b;
context_vector[context_idx].c = c;
context_vector[context_idx].d = d;
anychange = 1;
}
@ -1010,7 +997,7 @@ static unsigned diffreg(const char *file1, const char *file2, int flags)
int i;
anychange = 0;
context_vec_ptr = context_vec_start - 1;
context_idx = -1;
tempname1 = tempname2 = NULL;
/* Is any of them a directory? Then it's simple */