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/* fix file difflist - update file from difflist Author: Erik Baalbergen */
/* Change all K&R-style functions declarations to ANSI-style
declarations - Author: Alexandre Beletti (rhiguita@gmail.com) */
/* Notes: files old and old.patch are equal after the following commands
diff old new > difflist
patch old difflist > old.patch
* the diff output is assumed to be produced by my diff program.
* the difflist has the following form:
difflist ::= chunk*
chunk ::= append | delete | change ;
append ::= n1 'a' n2 [',' n3]? '\n' ['> ' line '\n'](n3 - n2 + 1)
delete ::= n1 [',' n2]? 'd' n3 '\n' ['< ' line '\n'](n2 - n1 + 1)
change ::= n1 [',' n2]? 'c' n3 [',' n4]? '\n'
['< ' line '\n'](n2 - n1 + 1)
'---\n'
['> ' line '\n'](n4 - n3 + 1)
where
- n[1234] is an unsigned integer
- "[pat](expr)" means "(expr) occurences of pat"
- "[pat]?" means "either pat or nothing"
* the information in the diff listing is checked against the file to which
it is applied; an error is printed if there is a conflict
*/
#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define IGNORE_WHITE_SPACE /* This makes it white space insensitive */
#ifdef IGNORE_WHITE_SPACE
#define strcmp strwcmp
#endif
#define LINELEN 1024
char *prog = 0, *processing = 0;
/* getline() already declared in stdio.h */
#define getline fix_getline
char *getline(FILE *fp, char *b);
char *range(char *s, int *p1, int *p2);
int getcommand(FILE *fp, int *o1, int *o2, char *pcmd, int *n1, int
*n2);
void fatal(const char *s, ...);
int strwcmp(char *s1, char *s2);
int whitespace(char ch);
char *
getline(FILE *fp, char *b)
{
if (fgets(b, LINELEN, fp) == NULL) fatal("unexpected eof");
return b;
}
#define copy(str) printf("%s", str)
int main(int argc, char **argv)
{
char cmd, *fl, *fd, obuf[LINELEN], nbuf[LINELEN];
int o1, o2, n1, n2, here;
FILE *fpf, *fpd;
prog = argv[0];
processing = argv[1];
if (argc != 3) fatal("use: %s original-file diff-list-file", prog);
if ((fpf = fopen(argv[1], "r")) == NULL) fatal("can't read %s", argv[1]);
if ((fpd = fopen(argv[2], "r")) == NULL) fatal("can't read %s", argv[2]);
here = 0;
while (getcommand(fpd, &o1, &o2, &cmd, &n1, &n2)) {
while (here < o1 - 1) {
here++;
copy(getline(fpf, obuf));
}
switch (cmd) {
case 'c':
case 'd':
if (cmd == 'd' && n1 != n2) fatal("delete count conflict");
while (o1 <= o2) {
fl = getline(fpf, obuf);
here++;
fd = getline(fpd, nbuf);
if (strncmp(fd, "<", (size_t)1))
fatal("illegal delete line");
if (strcmp(fl, fd + 2))
fatal("delete line conflict");
o1++;
}
if (cmd == 'd') break;
if (strcmp(getline(fpd, nbuf), "---\n"))
fatal("illegal separator in chunk");
/* FALLTHROUGH */
case 'a':
if (cmd == 'a') {
if (o1 != o2) fatal("append count conflict");
copy(getline(fpf, obuf));
here++;
}
while (n1 <= n2) {
if (strncmp(getline(fpd, nbuf), ">", (size_t)1))
fatal("illegal append line");
copy(nbuf + 2);
n1++;
}
break;
}
}
while (fgets(obuf, LINELEN, fpf) != NULL) copy(obuf);
return(0);
}
char *
range(char *s, int *p1, int *p2)
{
register int v1 = 0, v2;
while (isdigit(*s)) v1 = 10 * v1 + *s++ - '0';
v2 = v1;
if (*s == ',') {
s++;
v2 = 0;
while (isdigit(*s)) v2 = 10 * v2 + *s++ - '0';
}
if (v1 > v2) fatal("illegal range");
*p1 = v1;
*p2 = v2;
return s;
}
int getcommand(FILE *fp, int *o1, int *o2, char *pcmd, int *n1, int *n2)
{
char buf[LINELEN];
register char *s;
char cmd;
if ((s = fgets(buf, LINELEN, fp)) == NULL) return 0;
s = range(s, o1, o2);
if ((cmd = *s++) != 'a' && cmd != 'c' && cmd != 'd')
fatal("illegal command");
s = range(s, n1, n2);
if (*s != '\n' && s[1] != '\0')
fatal("extra characters at end of command: %s", s);
*pcmd = cmd;
return 1;
}
#ifdef __STDC__
void fatal(const char *s, ...)
{
va_list args;
va_start (args, s);
fprintf(stderr, "%s: processing: %s fatal: ", prog, processing);
vfprintf(stderr, s, args);
fprintf(stderr, "\n");
va_end(args);
exit(1);
}
#else
/* the K&R lib does not have vfprintf */
void fatal(const char *s, const char *a)
{
fprintf(stderr, "%s: processing: %s fatal: ", prog, processing);
fprintf(stderr, s, a);
fprintf(stderr, "\n");
exit(1);
}
#endif
#ifdef IGNORE_WHITE_SPACE
/* This routine is a white space insensitive version of strcmp.
It is needed for testing things which might have undergone
tab conversion or trailing space removal
Bret Mckee June, 1988 */
int strwcmp(char *s1, char *s2)
{
char *x1 = s1, *x2 = s2;
/* Remove leading white space */
while (whitespace(*s1)) s1++;
while (whitespace(*s2)) s2++;
do {
while ((*s1 == *s2) && *s1 && *s2) {
s1++;
s2++;
}
; /* consume identical characters */
while (whitespace(*s1)) s1++;
while (whitespace(*s2)) s2++;
} while (*s1 && *s2 && (*s1 == *s2));
if (*s1 - *s2)
fprintf(stderr, "Failing for (%x)[%s]\n (%x)[%s]\n",
(int) *s1, x1, (int) *s2, x2);
return(*s1 - *s2);
}
int whitespace(char ch)
{
switch (ch) {
case ' ':
case '\n':
case 0x0D:
case '\t':
return(1);
default: return(0);
}
}
#endif
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