diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/args.c | 49 |
1 files changed, 29 insertions, 20 deletions
@@ -14,7 +14,7 @@ // Note that pointer and long are always the same size, even on 64 bit. // : plus a string argument, keep most recent if more than one // * plus a string argument, appended to a list -// ? plus a signed long argument (TODO: Bounds checking?) +// # plus a signed long argument (TODO: Bounds checking?) // @ plus an occurrence counter (which is a long) // | this is required. If more than one marked, only one required. // (longopt) @@ -27,7 +27,7 @@ // + stop at first nonoption argument // <0 at least # leftover arguments needed (default 0) // >9 at most # leftover arguments needed (default MAX_INT) -// # don't show_usage() on unknown argument. +// ? don't show_usage() on unknown argument. // & first argument has imaginary dash (ala tar/ps) // If given twice, all arguments have imaginary dash @@ -39,18 +39,25 @@ /* This uses a getopt-like option string, but not getopt() itself. * - * Each option in options corresponds to a bit position in the return - * value (last argument is (1<<0), the next to last is (1<<1) and so on. - * If the option isn't seen in argv its bit is 0. Options which have an - * argument use the next vararg. (So varargs used by options go from left to - * right, but bits set by arguments go from right to left.) + * Each option in options corresponds to a bit position in the return + * value (last argument is (1<<0), the next to last is (1<<1) and so on). + * If the option isn't seen in argv[] its bit is 0. + * + * Options which have an argument fill in the corresponding slot in the global + * toys.command struct, which it treats as an array of longs (note that + * sizeof(long)==sizeof(pointer) is guaranteed by LP64). + * + * You don't have to free the option strings, which point into the environment + * space. List list objects should be freed by main() when command_main() + * returns. * * Example: - * get_optflags("ab:c:d", NULL, &bstring, &cstring); + * get_optflags() when toys.which->options="ab:c:d" * argv = ["command", "-b", "fruit", "-d"] - * flags = 5, bstring="fruit", cstring=NULL; + * flags = 5, toy[0]=NULL, toy[1]="fruit"; */ +// struct opts { struct opts *next; char c; @@ -101,8 +108,8 @@ static void gotflag(void) temp->arg = gof.arg; temp->next = *list; *list = temp; - } else if (type == '?') { - } else if (type == '@') { + } else if (type == '#') *(gof.this->arg) = atol((char *)gof.arg); + else if (type == '@') { } gof.arg = ""; @@ -139,7 +146,7 @@ void get_optflags(void) if (*options == '+') stopearly++; else if (*options == '<') minargs=*(++options)-'0'; else if (*options == '>') maxargs=*(++options)-'0'; - else if (*options == '#') gof.noerror++; + else if (*options == '?') gof.noerror++; else if (*options == '&') nodash++; else break; options++; @@ -179,11 +186,8 @@ void get_optflags(void) // If this is the start of a new option that wasn't a longopt, - } else if (index(":*?@", *options)) { + } else if (index(":*#@", *options)) { gof.this->type |= *options; - // Pointer and long guaranteed to be the same size by LP64. - gof.this->arg = (void *)nextarg; - *(nextarg++) = 0; } else if (*options == '|') { } else if (*options == '+') { } else if (*options == '~') { @@ -205,12 +209,17 @@ void get_optflags(void) } } - // Initialize shift bits (have to calculate this ahead of time because - // longopts jump into the middle of the list), and allocate space to - // store optargs. + // Initialize shift bits and pointers to store arguments. (We have to + // calculate this ahead of time because longopts jump into the middle of + // the list.) gof.argc = 0; - for (gof.this = gof.opts; gof.this; gof.this = gof.this->next) + for (gof.this = gof.opts; gof.this; gof.this = gof.this->next) { gof.this->shift = gof.argc++; + if (gof.this->type & 255) { + gof.this->arg = (void *)nextarg; + *(nextarg++) = 0; + } + } // Iterate through command line arguments, skipping argv[0] for (gof.argc=1; toys.argv[gof.argc]; gof.argc++) { |