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cansend: usage(): use a single call to fprintf() 

This makes the printed text in the code easier to read.
pull/489/head
Marc Kleine-Budde 2023-11-25 19:07:23 +01:00
parent 82be1b348b
commit 50b66ca403
1 changed files with 27 additions and 21 deletions
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48
cansend.c
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@ -58,27 +58,33 @@
static void print_usage(char *prg) static void print_usage(char *prg)
{ {
fprintf(stderr, "%s - send CAN-frames via CAN_RAW sockets.\n", prg); fprintf(stderr,
fprintf(stderr, "\nUsage: %s <device> <can_frame>.\n", prg); "%s - send CAN-frames via CAN_RAW sockets.\n"
fprintf(stderr, "\n<can_frame>:\n"); "\n"
fprintf(stderr, " <can_id>#{data} for Classical CAN 2.0 data frames\n"); "Usage: %s <device> <can_frame>.\n"
fprintf(stderr, " <can_id>#R{len} for Classical CAN 2.0 data frames\n"); "\n"
fprintf(stderr, " <can_id>#{data}_{dlc} for Classical CAN 2.0 data frames\n"); "<can_frame>:\n"
fprintf(stderr, " <can_id>#R{len}_{dlc} for Classical CAN 2.0 data frames\n"); " <can_id>#{data} for Classical CAN 2.0 data frames\n"
fprintf(stderr, " <can_id>##<flags>{data} for CAN FD frames\n\n"); " <can_id>#R{len} for Classical CAN 2.0 data frames\n"
fprintf(stderr, "<can_id>:\n" " <can_id>#{data}_{dlc} for Classical CAN 2.0 data frames\n"
" 3 (SFF) or 8 (EFF) hex chars\n"); " <can_id>#R{len}_{dlc} for Classical CAN 2.0 data frames\n"
fprintf(stderr, "{data}:\n" " <can_id>##<flags>{data} for CAN FD frames\n\n"
" 0..8 (0..64 CAN FD) ASCII hex-values (optionally separated by '.')\n"); "<can_id>:\n"
fprintf(stderr, "{len}:\n" " 3 (SFF) or 8 (EFF) hex chars\n"
" an optional 0..8 value as RTR frames can contain a valid dlc field\n"); "{data}:\n"
fprintf(stderr, "_{dlc}:\n" " 0..8 (0..64 CAN FD) ASCII hex-values (optionally separated by '.')\n"
" an optional 9..F data length code value when payload length is 8\n"); "{len}:\n"
fprintf(stderr, "<flags>:\n" " an optional 0..8 value as RTR frames can contain a valid dlc field\n"
" a single ASCII Hex value (0 .. F) which defines canfd_frame.flags\n\n"); "_{dlc}:\n"
fprintf(stderr, "Examples:\n"); " an optional 9..F data length code value when payload length is 8\n"
fprintf(stderr, " 5A1#11.2233.44556677.88 / 123#DEADBEEF / 5AA# / 123##1 / 213##311223344 /\n" "<flags>:\n"
" 1F334455#1122334455667788_B / 123#R / 00000123#R3 / 333#R8_E\n\n"); " a single ASCII Hex value (0 .. F) which defines canfd_frame.flags\n"
"\n"
"Examples:\n"
" 5A1#11.2233.44556677.88 / 123#DEADBEEF / 5AA# / 123##1 / 213##311223344 /\n"
" 1F334455#1122334455667788_B / 123#R / 00000123#R3 / 333#R8_E\n"
"\n",
prg, prg);
} }
int main(int argc, char **argv) int main(int argc, char **argv)