diff options
| -rw-r--r-- | sam.c | 15 |
1 files changed, 15 insertions, 0 deletions
@@ -62,6 +62,7 @@ struct Address { typedef struct { int start, end; /* interval [n,m] */ + bool mod; /* % every n-th match, implies n == m */ } Count; struct Command { @@ -649,6 +650,18 @@ static int parse_number(const char **s) { } static enum SamError parse_count(const char **s, Count *count) { + count->mod = **s == '%'; + + if (count->mod) { + (*s)++; + int n = parse_number(s); + if (!n) + return SAM_ERR_COUNT; + count->start = n; + count->end = n; + return SAM_ERR_OK; + } + const char *before = *s; if (!(count->start = parse_number(s)) && *s != before) return SAM_ERR_COUNT; @@ -1066,6 +1079,8 @@ static Filerange address_evaluate(Address *addr, File *file, Filerange *range, i static bool count_evaluate(Command *cmd) { Count *count = &cmd->count; + if (count->mod) + return count->start ? cmd->iteration % count->start == 0 : true; return count->start <= cmd->iteration && cmd->iteration <= count->end; } |