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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <errno.h>
char *
seq_open(char *file)
{
int fd;
struct stat st;
// env $SEQ or something
if (!file)
file = "map";
fd = open(file, O_RDONLY);
if (!fd)
return 0;
fstat(fd, &st);
char *map = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (map == MAP_FAILED)
return 0;
return map;
}
static const char *
readlin(const char *p)
{
static char b[PATH_MAX];
int r = readlink(p, b, sizeof b - 1);
if (r < 0)
r = 0;
b[r] = 0;
return b;
}
char *
parse_relnum(char *a, long cur, long last, long *out)
{
long base;
char *b;
if (strcmp(a, "+") == 0)
a = ".+1";
else if (strcmp(a, "-") == 0)
a = ".-1";
else if (strcmp(a, "$") == 0)
a = "-1";
if (*a == '.') {
a++;
base = cur;
} else if (*a == '-') {
base = last + 1;
} else {
base = 0;
}
errno = 0;
long d = strtol(a, &b, 10);
if (errno != 0) {
perror("strtol");
exit(1);
}
*out = base + d;
if (*out <= 0)
*out = 1;
if (*out > last)
*out = last;
return b;
}
int
main(int argc, char *argv[])
{
char *map = seq_open(0);
if (!map)
return 1;
long lines;
long cur = 0;
const char *curfile = readlin("map.cur");
char *curpath;
char *s, *t;
for (s = map, lines = 0; s; s = t) {
t = strchr(s+1, '\n');
if (!t)
break;
s++;
// printf("{%.*s}\n", t-s, s);
lines++;
// XXX compare modulo whitespace
if (!cur &&
strncmp(s, curfile, strlen(curfile)) == 0 &&
s[strlen(curfile)] == '\n')
cur = lines;
}
lines--;
long i, start, stop;
for (i = 1; i < argc; i++) {
char *a = argv[i];
start = stop = 0;
while (*a && *a != ':') {
char *b = parse_relnum(a, cur, lines, &start);
if (a == b) {
printf("huh\n");
exit(1);
}
a = b;
}
if (*a == ':') {
a++;
if (!*a) {
stop = lines;
} else {
char *b = parse_relnum(a, cur, lines, &stop);
if (a == b) {
printf("huh\n");
exit(1);
}
a = b;
}
} else if (!*a) {
stop = start;
} else {
printf("huh\n");
exit(1);
}
long line;
for (s = map, line = 0; s; s = t) {
t = strchr(s+1, '\n');
if (!t)
break;
s++;
line++;
if (line >= start && line <= stop) {
fwrite(s, 1, t-s, stdout);
putchar('\n');
cur = line;
curpath = s;
while (*curpath == ' ')
curpath++;
}
}
}
/*
char *e = strchr(curpath, '\n');
unlink("map.cur-");
symlink(strndup(curpath, e-curpath), "map.cur-");
rename("map.cur-", "map.cur");
*/
return 0;
}
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