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scrut(1): banish gotos

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dtb 2024-07-15 13:55:01 -06:00
parent 59fa3ed3d2
commit 2c4349872c
Signed by: trinity
GPG Key ID: 34C0543BBB6AF81B
1 changed files with 18 additions and 23 deletions
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41
src/scrut.c
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@ -20,9 +20,7 @@
#include <stdio.h> /* fprintf(3), stderr, NULL */ #include <stdio.h> /* fprintf(3), stderr, NULL */
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */ #include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
#include <string.h> /* memset(3), strchr(3) */ #include <string.h> /* memset(3), strchr(3) */
#ifndef EX_USAGE #include <sysexits.h> /* EX_USAGE */
# include <sysexits.h>
#endif
#include <unistd.h> /* access(3), getopt(3), F_OK, R_OK, W_OK, X_OK */ #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, #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_ISFIFO, S_ISGID, S_ISREG, S_ISLNK, S_ISSOCK,
@ -32,21 +30,30 @@ static char args[] = "bcdefgkprsuwxLS";
static char ops[(sizeof args) / (sizeof *args)]; static char ops[(sizeof args) / (sizeof *args)];
static char *program_name = "scrut"; static char *program_name = "scrut";
int usage(char *s){
fprintf(stderr, "Usage: %s [-%s] file...", s, args);
return EX_USAGE;
}
int main(int argc, char *argv[]){ int main(int argc, char *argv[]){
struct stat buf; struct stat buf;
int c; int c;
size_t i; size_t i;
char *p; char *p;
if(argc < 2) if (argc > 0) { program_name = argv[0]; }
goto usage; if (argc < 2) { return usage(program_name); }
memset(ops, '\0', sizeof ops); memset(ops, '\0', sizeof ops);
while((c = getopt(argc, argv, args)) != -1)
if((p = strchr(args, c)) == NULL) while ((c = getopt(argc, argv, args)) != -1)
goto usage; if ((p = strchr(args, c)) == NULL) { return usage(program_name); }
else else { ops[p - args] = c; }
ops[p - args] = c;
if (optind == argc) { return usage(program_name); }
argv += optind;
/* straighten out ops */ /* straighten out ops */
for(i = 0, p = ops; i < (sizeof ops) / (sizeof *ops); ++i) for(i = 0, p = ops; i < (sizeof ops) / (sizeof *ops); ++i)
if(ops[i] != '\0'){ if(ops[i] != '\0'){
@ -55,25 +62,13 @@ int main(int argc, char *argv[]){
ops[i] = '\0'; ops[i] = '\0';
} }
if(optind == argc)
goto usage;
argv += optind;
do{ if(access(*argv, F_OK) != 0 || lstat(*argv, &buf) == -1) do{ if(access(*argv, F_OK) != 0 || lstat(*argv, &buf) == -1)
return EXIT_FAILURE; /* doesn't exist or isn't stattable */ return EXIT_FAILURE; /* doesn't exist or isn't stattable */
for(i = 0; ops[i] != '\0'; ++i) for(i = 0; ops[i] != '\0'; ++i)
if(ops[i] == 'e') if(ops[i] == 'e')
continue; continue;
else if(ops[i] == 'h'){ else if(
usage: fprintf(stderr, "Usage: %s [-%s] file...\n",
argv[0] == NULL
? program_name
: argv[0],
args);
return EX_USAGE;
}else if(
(ops[i] == 'b' (ops[i] == 'b'
&& !S_ISBLK(buf.st_mode)) && !S_ISBLK(buf.st_mode))
|| (ops[i] == 'c' || (ops[i] == 'c'