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make independent of libfileis and faster, too

This commit is contained in:
dtb 2023-12-19 01:38:25 -07:00
parent 8516533533
commit e3d27c7963
1 changed files with 58 additions and 47 deletions
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105
scrut/scrut.c
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@ -1,69 +1,80 @@
#include <stdio.h> /* fprintf(3), stderr, NULL */
#include <string.h> /* memset(3) */
#include <string.h> /* strchr(3) */
#ifndef EX_USAGE
# include <sysexits.h>
#endif
#include <unistd.h> /* getopt(3) */
#include <unistd.h> /* access(3), getopt(3), F_OK, R_OK, W_OK, X_OK */
#include <sys/stat.h> /* lstat(3), stat struct, S_ISBLK, S_ISCHR, S_ISDIR,
* S_ISFIFO, S_ISGID, S_ISREG, S_ISLNK, S_ISSOCK,
* S_ISUID, S_ISVTX */
static char args[] = "bcdefghkprsuwxLS";
static char ops[(sizeof args) / (sizeof *args)];
static char *program_name = "scrut";
#include "libfileis.h"
struct {
char c;
int (*f)(char *p);
} argsdict[] = {
{ 'b', f_blockspecial },
{ 'c', f_charspecial },
{ 'd', f_directory },
{ 'e', f_exists },
{ 'f', f_regular },
{ 'g', f_gid },
{ 'p', f_fifospecial },
{ 'r', f_readable },
{ 'x', f_executable },
{ 'k', f_sticky },
{ 'u', f_uid },
{ 'w', f_writeable },
{ 'L', f_symlink },
{ 'S', f_socket },
{ '\0', NULL }
};
int main(int argc, char *argv[]){
char args[(sizeof argsdict) / (sizeof *argsdict) + 1];
struct stat buf;
int c;
int (*f[(sizeof argsdict) / (sizeof *argsdict)])(char *p);
size_t fi;
size_t i;
if(argc < 2)
goto usage;
for(i = 0; i < (sizeof argsdict) / (sizeof *argsdict); ++i)
args[i] = argsdict[i].c;
args[(sizeof argsdict) / (sizeof *argsdict)] = '\0';
fi = 0;
i = 0;
while((c = getopt(argc, argv, args)) != -1)
for(i = 0; i < (sizeof argsdict) / (sizeof *argsdict); ++i)
if(argsdict[i].c == '\0')
goto usage;
else if(argsdict[i].c == c){
f[fi++] = argsdict[i].f;
break;
}
if(strchr(args, c) == NULL)
goto usage;
else
ops[i++] = c;
ops[i] = '\0';
if(optind == argc){
usage: fprintf(stderr, "Usage: %s (-bcdefghkprsuwxLS) [file...]\n",
argv[0] == NULL ? program_name : argv[0]);
return EX_USAGE;
}
if(optind == argc)
goto usage;
argv += optind;
do for(i = 0; i < fi; ++i)
if(!f[i](*argv))
do{ if(access(*argv, F_OK) != 0 || lstat(*argv, &buf) == -1)
return 1; /* doesn't exist or isn't stattable */
for(i = 0; ops[i] != '\0'; ++i)
if(ops[i] == 'e')
continue;
else if(ops[i] == 'h'){
usage: fprintf(stderr, "Usage: %s (-%s) [file...]\n",
argv[0] == NULL
? program_name
: argv[0],
args);
return EX_USAGE;
}else if(
(ops[i] == 'b'
&& !S_ISBLK(buf.st_mode))
|| (ops[i] == 'c'
&& !S_ISCHR(buf.st_mode))
|| (ops[i] == 'd'
&& !S_ISDIR(buf.st_mode))
|| (ops[i] == 'f'
&& !S_ISREG(buf.st_mode))
|| (ops[i] == 'g'
&& !(buf.st_mode & S_ISGID))
|| (ops[i] == 'k'
&& !(buf.st_mode & S_ISVTX))
|| (ops[i] == 'p'
&& !S_ISFIFO(buf.st_mode))
|| (ops[i] == 'r'
&& access(*argv, R_OK) != 0)
|| (ops[i] == 'u'
&& !(buf.st_mode & S_ISUID))
|| (ops[i] == 'w'
&& access(*argv, W_OK) != 0)
|| (ops[i] == 'x'
&& access(*argv, X_OK) != 0)
|| (ops[i] == 'L'
&& !S_ISLNK(buf.st_mode))
|| (ops[i] == 'S'
&& !S_ISSOCK(buf.st_mode)))
return 1;
while(*++argv != NULL);
}while(*++argv != NULL);
return 0;
}