/** * 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 #include #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) { 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) { int dir = 0; char *end; switch (*str) { case '-': dir = -1; break; case '+': dir = +1; break; } str += !!dir; if (dir && !direction) return -1; else if (dir) *direction = dir; if (!isdigit(*str)) return -1; *temp = (errno = 0, strtol)(str, &end, 10); if ((errno && !((errno == ERANGE) && (*temp == LONG_MAX))) || *end || (*temp < lower)) return -1; return 0; } /** * 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) { int points = 0; memset(ts, 0, sizeof(*ts)); /* Parse seconds. */ if (!isdigit(*str)) return -1; while (isdigit(*str)) { ts->tv_sec *= 10; ts->tv_sec += *str++ & 15; } /* End? */ if (!*str) return 0; if (*str != '.') return -1; /* Parse nanoseconds.*/ for (; (points++ < 9) && isdigit(*str); str++) { ts->tv_nsec *= 10; ts->tv_nsec += *str++ & 15; } if (points == 9) { if (!isdigit(*str)) return -1; if (*str++ >= '5') { ts->tv_nsec += 1; if (ts->tv_nsec == 1000000000L) ts->tv_sec += 1, ts->tv_nsec = 0; } } while (isdigit(*str)) str++; if (*str) return -1; /* End! */ return 0; } /** * 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 *settings) { int location_set = 0; char *p; char *arg; int c = 0; memset(settings, 0, sizeof(*settings)); settings->natural_temp = 6500; settings->day_temp = 5500; settings->night_temp = 3500; settings->trans_speed = 50; #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, &(settings->latitude), 90.0)); usage(parse_location(arg, &(settings->longitude), 180.0)); break; case 't': PLUS(settings->day_temp = 5500, settings->night_temp = 3500); settings->temp = settings->day_temp = settings->night_temp = 0; settings->temp_direction = 0; if ((p = strchr(arg = ARGF(), ':'))) { *p++ = '\0'; usage(parse_temperature(arg, &(settings->day_temp), NULL, 1000)); usage(parse_temperature(p, &(settings->night_temp), NULL, 1000)); } else { usage(parse_temperature(arg, &(settings->temp), &(settings->temp_direction), 1000)); } break; case 'T': PLUS(settings->natural_temp = 6500); usage(parse_temperature(ARGF(), &(settings->natural_temp), NULL, 1000)); break; case 's': PLUS(settings->trans_speed = 50); settings->trans_speed = 0; usage(parse_timespec(ARGF(), &(settings->transition))); break; case 'S': PLUS(settings->trans_speed = 0); usage(parse_temperature(ARGF(), &(settings->trans_speed), NULL, 1)); break; case 'h': settings->hookpath = (plus ? NULL : ARGF()); break; case 'd': c++; /* Fall though. */ case 'e': c++; /* Fall though. */ case 'm': c++; #define REALLOC(VAR, N) !(VAR = realloc(VAR, (N) * sizeof(*VAR))) PLUS(settings->monitors_n = 0, free(settings->monitors_id), free(settings->monitors_arg)); settings->monitors_n++; if (REALLOC(settings->monitors_id, settings->monitors_n)) goto fail; if (REALLOC(settings->monitors_arg, settings->monitors_n)) goto fail; settings->monitors_id[settings->monitors_n - 1] = ARGF(); settings->monitors_arg[settings->monitors_n - 1] = (c == 3 ? 'm' : c == 2 ? 'e' : 'd'), c = 0; break; case 'p': settings->print_status = !plus; break; case 'n': settings->panic_start = !plus; break; case 'N': settings->panic_else = !plus; break; case 'o': settings->set_and_exit = !plus; break; case 'x': settings->ignore_calib = !plus; break; case 'i': settings->negative = !plus; break; case 'b': settings->use_bus = !plus; break; default: usage(1); break; } ARGEND; usage(argc); if (!location_set && !(settings->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); } fail: 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 n = 0, i = 0; size_t aux; 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 = NULL; struct settings s_; char *buf = buffer; int saved_errno; 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) { if (!(*s = s_, s->monitors_id = malloc(s_.monitors_n * sizeof(char*)))) goto fail; if (!(*s = s_, s->monitors_arg = malloc(s_.monitors_n * sizeof(char)))) goto fail; } s->hookpath = buf; buf = strchr(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: saved_errno = errno; free(s->monitors_id), free(s->monitors_arg), free(s), *settings = NULL; errno = saved_errno; return 0; }