sbase/test.c

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/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "util.h"
static bool unary(const char *, const char *);
static bool binary(const char *, const char *, const char *);
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static void usage(void);
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int
main(int argc, char *argv[])
{
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bool ret = false, not = false;
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argv0 = argv[0];
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/* [ ... ] alias */
if(!strcmp(argv[0], "[")) {
if(strcmp(argv[argc-1], "]") != 0)
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usage();
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argc--;
}
if(argc > 1 && !strcmp(argv[1], "!")) {
not = true;
argv++;
argc--;
}
switch(argc) {
case 2:
ret = *argv[1] != '\0';
break;
case 3:
ret = unary(argv[1], argv[2]);
break;
case 4:
ret = binary(argv[1], argv[2], argv[3]);
break;
default:
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usage();
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}
if(not)
ret = !ret;
return ret ? EXIT_SUCCESS : EXIT_FAILURE;
}
bool
unary(const char *op, const char *arg)
{
struct stat st;
int r;
if(op[0] != '-' || op[1] == '\0' || op[2] != '\0')
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usage();
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switch(op[1]) {
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case 'b': case 'c': case 'd': case 'f': case 'g':
case 'p': case 'S': case 's': case 'u':
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if((r = stat(arg, &st)) == -1)
return false; /* -e */
switch(op[1]) {
case 'b':
return S_ISBLK(st.st_mode);
case 'c':
return S_ISCHR(st.st_mode);
case 'd':
return S_ISDIR(st.st_mode);
case 'f':
return S_ISREG(st.st_mode);
case 'g':
return st.st_mode & S_ISGID;
case 'p':
return S_ISFIFO(st.st_mode);
case 'S':
return S_ISSOCK(st.st_mode);
case 's':
return st.st_size > 0;
case 'u':
return st.st_mode & S_ISUID;
}
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case 'e':
return access(arg, F_OK) == 0;
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case 'r':
return access(arg, R_OK) == 0;
case 'w':
return access(arg, W_OK) == 0;
case 'x':
return access(arg, X_OK) == 0;
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case 'h': case 'L':
return lstat(arg, &st) == 0 && S_ISLNK(st.st_mode);
case 't':
return isatty((int)estrtol(arg, 0));
case 'n':
return arg[0] != '\0';
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case 'z':
return arg[0] == '\0';
default:
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usage();
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}
return false; /* should not reach */
}
bool
binary(const char *arg1, const char *op, const char *arg2)
{
int i;
long narg1, narg2;
enum operator { EQ, GE, GT, LE, LT, NE, STREQ, STRNE } oper;
char *optexts[] = { "-eq", "-ge", "-gt", "-le", "-lt", "-ne",
"=", "!="
};
for (i = 0; i < LEN(optexts); i++) {
if (strcmp(op, optexts[i]) == 0) {
oper = i;
switch (oper) {
case STREQ:
return strcmp(arg1, arg2) == 0;
case STRNE:
return strcmp(arg1, arg2) != 0;
default:
narg1 = estrtol(arg1, 0);
narg2 = estrtol(arg2, 0);
switch (oper) {
case EQ:
return narg1 == narg2;
case GE:
return narg1 >= narg2;
case GT:
return narg1 > narg2;
case LE:
return narg1 <= narg2;
case LT:
return narg1 < narg2;
case NE:
return narg1 != narg2;
default:
usage();
}
}
}
}
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return false;
}
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void
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usage(void)
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{
const char *ket = (*argv0 == '[') ? " ]" : "";
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eprintf("usage: %s string%s\n"
" %s [!] [-bcdefghLnprSstuwxz] string%s\n", argv0, ket, argv0, ket);
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}