diff options
Diffstat (limited to 'rev.c')
-rw-r--r-- | rev.c | 48 |
1 files changed, 48 insertions, 0 deletions
@@ -0,0 +1,48 @@ +#include <u.h> +#include <libc.h> + +void +swap(char *a, char *b) +{ + char tmp; + + tmp = *a; + *a = *b; + *b = tmp; +} + +void +rev(char *s, ulong len) +{ + char *e; + + e = s+len; + while(s < e) + swap(s++, --e); +} + +void +usage(void) +{ + fprint(2, "usage: %s text ...\n", argv0); + exits("usage"); +} + +void +main(int argc, char *argv[]) +{ + int first; + + first = 1; + ARGBEGIN{ + default: usage(); + }ARGEND; + if(argc < 1) + usage(); + while(argc--){ + rev(argv[argc], strlen(argv[argc])); + print(first ? first--, "%s" : " %s", argv[argc]); + } + print("\n"); + exits(nil); +} |