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#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdnoreturn.h>
#include <string.h>
#include <sys/stat.h>
struct perm {
char *name;
mode_t mode;
};
static struct perm *perms;
static size_t permslen, permscap;
static noreturn void
fatal(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
fputc(' ', stderr);
perror(NULL);
} else {
fputc('\n', stderr);
}
exit(1);
}
static void
addperm(struct perm *p)
{
if (permslen == permscap) {
permscap = permscap ? permscap * 2 : 64;
if (permscap > SIZE_MAX / sizeof(perms[0])) {
errno = ENOMEM;
fatal("realloc:");
}
perms = realloc(perms, permscap * sizeof(perms[0]));
if (!perms)
fatal("realloc:");
}
perms[permslen++] = *p;
}
static void
readperm(FILE *file, struct perm *perm)
{
static char *line;
static size_t size;
ssize_t n;
char *s, *mode;
n = getline(&line, &size, file);
if (n < 0) {
if (ferror(file))
fatal("getline:");
perm->name = NULL;
return;
}
if (n && line[n - 1] == '\n')
line[n - 1] = '\0';
mode = s = line;
s = strchr(s, ' ');
if (!s || s == mode)
fatal("invalid permissions file");
*s++ = '\0';
perm->name = strdup(s);
if (!perm->name)
fatal("strdup:");
perm->mode = strtoul(mode, &s, 8);
if (*s)
fatal("invalid mode '%s'", mode);
}
static int
permcmp(struct perm *a, struct perm *b)
{
return a->name ? b->name ? strcmp(a->name, b->name) : -1 : !!b->name;
}
static noreturn void
usage(void)
{
fprintf(stderr, "usage: mergeperms old cur new\n");
exit(2);
}
int
main(int argc, char *argv[])
{
FILE *oldf, *curf, *newf;
struct perm old, cur, new;
int ij, ik, jk;
int ret;
if (argc != 4)
usage();
ret = 0;
oldf = fopen(argv[1], "r");
if (!oldf)
fatal("open %s:", argv[1]);
curf = fopen(argv[2], "r");
if (!curf)
fatal("open %s:", argv[2]);
newf = fopen(argv[3], "r");
if (!newf)
fatal("open %s:", argv[3]);
readperm(oldf, &old);
readperm(curf, &cur);
readperm(newf, &new);
for (;;) {
ij = permcmp(&old, &cur);
ik = permcmp(&old, &new);
if (ij < 0 && ik < 0 && old.name) {
readperm(oldf, &old);
continue;
}
if (!old.name && !cur.name && !new.name)
break;
jk = permcmp(&cur, &new);
if ((jk < 0 && ij == 0 && old.mode == cur.mode) || (jk > 0 && ik == 0 && old.mode == new.mode)) {
/* deleted in cur or new and unchanged in the other */
} else if (jk < 0) {
if (ij == 0)
ret = 3;
addperm(&cur);
} else if (jk > 0) {
if (ik == 0)
ret = 3;
addperm(&new);
} else if (ij == 0 && old.mode == cur.mode) {
addperm(&new);
} else {
if (cur.mode != new.mode && (ik != 0 || old.mode != new.mode))
ret = 3;
addperm(&cur);
}
if (jk <= 0)
readperm(curf, &cur);
if (jk >= 0)
readperm(newf, &new);
}
fclose(curf);
curf = fopen(argv[2], "w");
if (!curf)
fatal("open %s:", argv[1]);
for (; permslen > 0; --permslen, ++perms)
fprintf(curf, "%#o %s\n", perms->mode, perms->name);
fflush(curf);
if (ferror(curf))
fatal("write error");
return ret;
}
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