/** * Copyright © 2016 Mattias Andrée * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "settings.h" #include "arg.h" #include "macros.h" #include #include #include #include #include /** * Print usage information and exit if a condition is met. * * @param condition Do no do anything iff this is zero. */ static void usage(int condition) { if (!condition) return; fprintf(stderr, "Usage: %s [OPTIONS]...\n" "See `man 1 radharc` for more information.\n", !argv0 ? "radharc" : argv0), exit(2); } /** * Parse a temperature string. * * @param str The temperature string. * @param temp Output parameter for the temperature. * Overflow is truncated. * @param direction Unless `NULL`, will be set to +1 if `str` * starts with a '+', `-1` if `str` starts * with a '-', 0 otherwise. If `NULL` and * `str` starts with a '-' or a '+', the * function will fail. * @param lower The function shall fail if the evaluated * temperature is below this. * @return 0 on success, -1 on error. */ static int parse_temperature(const char *str, long int *temp, int *direction, int lower) { char *end; int dir = *str == '-' ? -1 : *str == '+' ? +1 : 0; str += !!dir; t (dir && !direction); if (dir) *direction = dir; t (!isdigit(*str)); *temp = (errno = 0, strtol)(str, &end, 10); t ((errno && !((errno == ERANGE) && (*temp == LONG_MAX))) || *end || (*temp < lower)); return 0; fail: return -1; } /** * Parse a string as a positively valued `struct timespec`. * * @param str The string. * @param ts Output parameter for the value. * @return 0 on success, -1 on error. */ static int parse_timespec(const char *str, struct timespec *ts) { #define DIGIT(var, c) var += (var) * 10 + ((c) & 15); #define ALL_DIGITS(cond, var) while ((cond) && isdigit(*str)) DIGIT(var, *str++) int points = 0; memset(ts, 0, sizeof(*ts)); /* Parse seconds. */ t (!isdigit(*str)); ALL_DIGITS(1, ts->tv_sec); /* End? */ if (!*str) return 0; t (*str != '.'); /* Parse nanoseconds.*/ ALL_DIGITS(points++ < 9, ts->tv_nsec); if ((points == 9) && isdigit(*str) && (*str++ >= '5') && (++(ts->tv_nsec) == 1000000000L)) ts->tv_sec += 1, ts->tv_nsec = 0; while (isdigit(*str)) str++; t (*str); /* End! */ return 0; fail: return -1; } /** * Parse a latitude or a longitude value. * * @param str The string. * @param loc Output parameter for the value. * @param limit The limit of the absolute value. * @return 0 on success, -1 on error. */ static int parse_location(char *str, double *loc, double limit) { char* end; if (strstr(str, "−") == str) /* Support proper minus. */ *(str += strlen("−") - 1) = '-'; if ((*str != '-') && (*str != '+') && (*str != '.') && !isdigit(*str)) return -1; *loc = (errno = 0, strtod)(str, &end); return -(errno || *loc || (fabs(*loc) > limit)); } /** * Parse the command line. * * @param argc The number of elements in `argv`. * @param argv The commnad line arguments including the zeroth elemenet. * @param settings Output parameter for the settings. */ void parse_command_line(int argc, char *argv[], struct settings *s) { int location_set = 0; char *p; char *arg; int c = 0; memset(s, 0, sizeof(*s)); s->natural_temp = 6500; s->day_temp = 5500; s->night_temp = 3500; s->trans_speed = 50; #define BOOLEAN(var) var = !plus; break #define PLUS(...) (plus ? (__VA_ARGS__) : 0) ARGBEGIN { case 'l': PLUS(location_set = 0); usage(!(p = strchr(arg = ARGF(), ':'))); *p++ = '\0', location_set = 1; usage(parse_location(arg, &(s->latitude), 90.0)); usage(parse_location(p, &(s->longitude), 180.0)); break; case 't': PLUS(s->day_temp = 5500, s->night_temp = 3500); s->temp = s->day_temp = s->night_temp = 0, s->temp_direction = 0; if ((p = strchr(arg = ARGF(), ':'))) { *p++ = '\0'; usage(parse_temperature(arg, &(s->day_temp), NULL, 1000)); usage(parse_temperature(p, &(s->night_temp), NULL, 1000)); } else { usage(parse_temperature(arg, &(s->temp), &(s->temp_direction), 1000)); } break; case 'T': PLUS(s->natural_temp = 6500); usage(parse_temperature(ARGF(), &(s->natural_temp), NULL, 1000)); break; case 's': PLUS(s->trans_speed = 50); s->trans_speed = 0; usage(parse_timespec(ARGF(), &(s->transition))); break; case 'S': PLUS(s->trans_speed = 0); usage(parse_temperature(ARGF(), &(s->trans_speed), NULL, 1)); break; case 'h': s->hookpath = (plus ? NULL : ARGF()); break; case 'd': c++; /* Fall though. */ case 'e': c++; /* Fall though. */ case 'm': c++; PLUS(s->monitors_n = 0, free(s->monitors_id), free(s->monitors_arg)); xrealloc(&(s->monitors_id), s->monitors_n + 1); xrealloc(&(s->monitors_arg), s->monitors_n + 1); s->monitors_id[s->monitors_n] = ARGF(); s->monitors_arg[s->monitors_n++] = (c == 3 ? 'm' : c == 2 ? 'e' : 'd'), c = 0; break; case 'p': BOOLEAN(s->print_status); case 'n': BOOLEAN(s->panic_start); case 'N': BOOLEAN(s->panic_else); case 'o': BOOLEAN(s->set_and_exit); case 'x': BOOLEAN(s->ignore_calib); case 'i': BOOLEAN(s->negative); case 'b': BOOLEAN(s->use_bus); default: usage(1); break; } ARGEND; usage(argc); if (!location_set && !(s->temp)) fprintf(stderr, "%s: The -l option is mandatory, unless single value -t is used. " "See `man 1 radharc` for more information.\n", !argv0 ? "radharc" : argv0), exit(2); return; fail: libhaiku_perror(argv0 ? argv0 : "radharc"); exit(1); } /** * Marshal settings into a buffer. * * @param buffer The buffer, `NULL` if you want to know the required size. * @param settings The settings to marshal. * @return The size of the output. */ size_t marshal_settings(char *buffer, const struct settings *settings) { #define MARSHAL(N, DATUMP) (n += aux = (N), (buf ? (memcpy(buf, DATUMP, aux), buf += aux, 0) : 0)) size_t aux, n = 0, i = 0; char *buf = buffer; if (buffer) i = marshal_settings(NULL, settings); MARSHAL(sizeof(i), &i); MARSHAL(sizeof(*settings), settings); if (settings->hookpath) MARSHAL(strlen(settings->hookpath) + 1, settings->hookpath); if (settings->monitors_arg) MARSHAL(settings->monitors_n, settings->monitors_arg); for (i = 0; i < settings->monitors_n; i++) MARSHAL(strlen(settings->monitors_id[i]) + 1, settings->monitors_id[i]); return n; } /** * Unmarshal settings from a buffer. * * @param buffer The buffer. * @param settings Output parameter for the settings, will be allocated. * @return The number of unmarshalled bytes, 0 on error. */ size_t unmarshal_settings(char *buffer, struct settings **settings) { #define UNMARSHAL(N, DATUMP) (aux = (N), memcpy((DATUMP), buf, aux), buf += aux) size_t n, aux, i; struct settings s_, *s = NULL; char *buf = buffer; UNMARSHAL(sizeof(n), &n); if (!(s = *settings = malloc(n - sizeof(n)))) return 0; s->monitors_id = NULL, s->monitors_arg = NULL; UNMARSHAL(sizeof(s_), &s_); if (s_.monitors_n) { *s = s_; xmalloc(&(s->monitors_id), s_.monitors_n); xmalloc(&(s->monitors_arg), s_.monitors_n); } buf = strchr(s->hookpath = buf, '\0') + 1; UNMARSHAL(s_.monitors_n, s->monitors_arg); for (i = 0; i < s_.monitors_n; i++) UNMARSHAL(strlen(buf + 1), s->monitors_id[i]); return n; fail: CLEANUP(free(s->monitors_id), free(s->monitors_arg), free(s), *settings = NULL); return 0; }