diff options
Diffstat (limited to 'toys/posix')
| -rw-r--r-- | toys/posix/test.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/toys/posix/test.c b/toys/posix/test.c new file mode 100644 index 00000000..052b8deb --- /dev/null +++ b/toys/posix/test.c @@ -0,0 +1,159 @@ +/* test.c - evaluate expression + * + * Copyright 2018 Rob Landley <rob@landley.net> + * + * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html + +USE_TEST(NEWTOY(test, 0, TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_NOHELP)) + +config TEST + bool "test" + default y + help + usage: test [-bcdefghLPrSsuwx PATH] [-nz STRING] [-t FD] [X ?? Y] + + Return true or false by performing tests. (With no arguments return false.) + + --- Tests with a single argument (after the option): + PATH is/has: + -b block device -f regular file -p fifo -u setuid bit + -c char device -g setgid -r read bit -w write bit + -d directory -h symlink -S socket -x execute bit + -e exists -L symlink -s nonzero size + STRING is: + -n nonzero size -z zero size (STRING by itself implies -n) + FD (integer file descriptor) is: + -t a TTY + + --- Tests with one argument on each side of an operator: + Two strings: + = are identical != differ + Two integers: + -eq equal -gt first > second -lt first < second + -ne not equal -ge first >= second -le first <= second + + --- Modify or combine tests: + ! EXPR not (swap true/false) EXPR -a EXPR and (are both true) + ( EXPR ) evaluate this first EXPR -o EXPR or (is either true) +*/ + +#include "toys.h" + +// Consume 3, 2, or 1 argument test, returning result and *count used. +int do_test(char **args, int *count) +{ + char c, *s; + int i; + + if (*count>=3) { + *count = 3; + char *s = args[1], *ss = "eqnegtgeltle"; + if (!strcmp(s, "=") || !strcmp(s, "==")) return !strcmp(args[0], args[2]); + if (!strcmp(s, "!=")) return strcmp(args[0], args[2]); + if (*s=='-' && strlen(s)==3 && (s = strstr(ss, s+1)) && !((i = s-ss)&1)) { + long long a = atolx(args[0]), b = atolx(args[2]); + + if (!i) return a == b; + if (i==2) return a != b; + if (i==4) return a > b; + if (i==6) return a >= b; + if (i==8) return a < b; + if (i==10) return a<= b; + } + } + s = *args; + if (*count>=2 && *s == '-' && s[1] && !s[2]) { + *count = 2; + c = s[1]; + if (-1 != (i = stridx("hLbcdefgpSusxwr", c))) { + struct stat st; + + // stat or lstat, then handle rwx and s + if (-1 == ((i<2) ? lstat : stat)(args[1], &st)) return 0; + if (i>=12) return !!(st.st_mode&(0x111<<(i-12))); + if (c == 's') return !!st.st_size; // otherwise 1<<32 == 0 + + // handle file type checking and SUID/SGID + if ((i = (unsigned short []){80,80,48,16,32,0,64,2,8,96,4}[i]<<9)>=4096) + return (st.st_mode&S_IFMT) == i; + else return (st.st_mode & i) == i; + } else if (c == 'z') return !*args[1]; + else if (c == 'n') return *args[1]; + else if (c == 't') return isatty(atolx(args[1])); + } + return *count = 0; +} + +#define NOT 1 // Most recent test had an odd number of preceding ! +#define AND 2 // test before -a failed since -o or ( so force false +#define OR 4 // test before -o succeeded since ( so force true +void test_main(void) +{ + char *s; + int pos, paren, pstack, result = 0; + + toys.exitval = 2; + if (!strcmp("[", toys.which->name)) + if (!toys.optc || strcmp("]", toys.optargs[--toys.optc])) + error_exit("Missing ']'"); + + // loop through command line arguments + if (toys.optc) for (pos = paren = pstack = 0; ; pos++) { + int len = toys.optc-pos; + + if (!toys.optargs[pos]) perror_exit("need arg @%d", pos); + + // Evaluate next test + result = do_test(toys.optargs+pos, &len); + pos += len; + // Single argument could be ! ( or nonempty + if (!len) { + if (toys.optargs[pos+1]) { + if (!strcmp("!", toys.optargs[pos])) { + pstack ^= NOT; + continue; + } + if (!strcmp("(", toys.optargs[pos])) { + if (++paren>9) perror_exit("bad ("); + pstack <<= 3; + continue; + } + } + result = *toys.optargs[pos++]; + } + s = toys.optargs[pos]; + for (;;) { + + // Handle pending ! -a -o (the else means -o beats -a) + if (pstack&NOT) result = !result; + pstack &= ~NOT; + if (pstack&OR) result = 1; + else if (pstack&AND) result = 0; + + // Do it again for every ) + if (!paren || !s || strcmp(")", s)) break; + paren--; + pstack >>= 3; + s = toys.optargs[++pos]; + } + + // Out of arguments? + if (!s) { + if (paren) perror_exit("need )"); + break; + } + + // are we followed by -a or -o? + + if (!strcmp("-a", s)) { + if (!result) pstack |= AND; + } else if (!strcmp("-o", s)) { + // -o flushes -a even if previous test was false + pstack &=~AND; + if (result) pstack |= OR; + } else error_exit("too many arguments"); + } + + // Invert C logic to get shell logic + toys.exitval = !result; +} |