diff options
Diffstat (limited to 'tools/bpf/bpftool/main.c')
-rw-r--r-- | tools/bpf/bpftool/main.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c index 4879f6395c7e..e916ff25697f 100644 --- a/tools/bpf/bpftool/main.c +++ b/tools/bpf/bpftool/main.c @@ -117,6 +117,35 @@ bool is_prefix(const char *pfx, const char *str) return !memcmp(str, pfx, strlen(pfx)); } +/* Last argument MUST be NULL pointer */ +int detect_common_prefix(const char *arg, ...) +{ + unsigned int count = 0; + const char *ref; + char msg[256]; + va_list ap; + + snprintf(msg, sizeof(msg), "ambiguous prefix: '%s' could be '", arg); + va_start(ap, arg); + while ((ref = va_arg(ap, const char *))) { + if (!is_prefix(arg, ref)) + continue; + count++; + if (count > 1) + strncat(msg, "' or '", sizeof(msg) - strlen(msg) - 1); + strncat(msg, ref, sizeof(msg) - strlen(msg) - 1); + } + va_end(ap); + strncat(msg, "'", sizeof(msg) - strlen(msg) - 1); + + if (count >= 2) { + p_err(msg); + return -1; + } + + return 0; +} + void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep) { unsigned char *data = arg; |