/* * Commandline option parsing functions * * Copyright (c) 2003-2008 Fabrice Bellard * Copyright (c) 2009 Kevin Wolf <kwolf@redhat.com> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <stdio.h> #include <string.h> #include "qemu-common.h" #include "qemu-option.h" /* * Extracts the name of an option from the parameter string (p points at the * first byte of the option name) * * The option name is delimited by delim (usually , or =) or the string end * and is copied into buf. If the option name is longer than buf_size, it is * truncated. buf is always zero terminated. * * The return value is the position of the delimiter/zero byte after the option * name in p. */ const char *get_opt_name(char *buf, int buf_size, const char *p, char delim) { char *q; q = buf; while (*p != '\0' && *p != delim) { if (q && (q - buf) < buf_size - 1) *q++ = *p; p++; } if (q) *q = '\0'; return p; } /* * Extracts the value of an option from the parameter string p (p points at the * first byte of the option value) * * This function is comparable to get_opt_name with the difference that the * delimiter is fixed to be comma which starts a new option. To specify an * option value that contains commas, double each comma. */ const char *get_opt_value(char *buf, int buf_size, const char *p) { char *q; q = buf; while (*p != '\0') { if (*p == ',') { if (*(p + 1) != ',') break; p++; } if (q && (q - buf) < buf_size - 1) *q++ = *p; p++; } if (q) *q = '\0'; return p; } int get_next_param_value(char *buf, int buf_size, const char *tag, const char **pstr) { const char *p; char option[128]; p = *pstr; for(;;) { p = get_opt_name(option, sizeof(option), p, '='); if (*p != '=') break; p++; if (!strcmp(tag, option)) { *pstr = get_opt_value(buf, buf_size, p); if (**pstr == ',') { (*pstr)++; } return strlen(buf); } else { p = get_opt_value(NULL, 0, p); } if (*p != ',') break; p++; } return 0; } int get_param_value(char *buf, int buf_size, const char *tag, const char *str) { return get_next_param_value(buf, buf_size, tag, &str); } int check_params(char *buf, int buf_size, const char * const *params, const char *str) { const char *p; int i; p = str; while (*p != '\0') { p = get_opt_name(buf, buf_size, p, '='); if (*p != '=') { return -1; } p++; for (i = 0; params[i] != NULL; i++) { if (!strcmp(params[i], buf)) { break; } } if (params[i] == NULL) { return -1; } p = get_opt_value(NULL, 0, p); if (*p != ',') { break; } p++; } return 0; } /* * Searches an option list for an option with the given name */ QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list, const char *name) { while (list && list->name) { if (!strcmp(list->name, name)) { return list; } list++; } return NULL; } static int parse_option_bool(const char *name, const char *value, int *ret) { if (value != NULL) { if (!strcmp(value, "on")) { *ret = 1; } else if (!strcmp(value, "off")) { *ret = 0; } else { fprintf(stderr, "Option '%s': Use 'on' or 'off'\n", name); return -1; } } else { *ret = 1; } return 0; } static int parse_option_number(const char *name, const char *value, uint64_t *ret) { char *postfix; uint64_t number; if (value != NULL) { number = strtoull(value, &postfix, 0); if (*postfix != '\0') { fprintf(stderr, "Option '%s' needs a number as parameter\n", name); return -1; } *ret = number; } else { fprintf(stderr, "Option '%s' needs a parameter\n", name); return -1; } return 0; } static int parse_option_size(const char *name, const char *value, uint64_t *ret) { char *postfix; double sizef; if (value != NULL) { sizef = strtod(value, &postfix); switch (*postfix) { case 'T': sizef *= 1024; case 'G': sizef *= 1024; case 'M': sizef *= 1024; case 'K': case 'k': sizef *= 1024; case 'b': case '\0': *ret = (uint64_t) sizef; break; default: fprintf(stderr, "Option '%s' needs size as parameter\n", name); fprintf(stderr, "You may use k, M, G or T suffixes for " "kilobytes, megabytes, gigabytes and terabytes.\n"); return -1; } } else { fprintf(stderr, "Option '%s' needs a parameter\n", name); return -1; } return 0; } /* * Sets the value of a parameter in a given option list. The parsing of the * value depends on the type of option: * * OPT_FLAG (uses value.n): * If no value is given, the flag is set to 1. * Otherwise the value must be "on" (set to 1) or "off" (set to 0) * * OPT_STRING (uses value.s): * value is strdup()ed and assigned as option value * * OPT_SIZE (uses value.n): * The value is converted to an integer. Suffixes for kilobytes etc. are * allowed (powers of 1024). * * Returns 0 on succes, -1 in error cases */ int set_option_parameter(QEMUOptionParameter *list, const char *name, const char *value) { int flag; // Find a matching parameter list = get_option_parameter(list, name); if (list == NULL) { fprintf(stderr, "Unknown option '%s'\n", name); return -1; } // Process parameter switch (list->type) { case OPT_FLAG: if (-1 == parse_option_bool(name, value, &flag)) return -1; list->value.n = flag; break; case OPT_STRING: if (value != NULL) { list->value.s = qemu_strdup(value); } else { fprintf(stderr, "Option '%s' needs a parameter\n", name); return -1; } break; case OPT_SIZE: if (-1 == parse_option_size(name, value, &list->value.n)) return -1; break; default: fprintf(stderr, "Bug: Option '%s' has an unknown type\n", name); return -1; } return 0; } /* * Sets the given parameter to an integer instead of a string. * This function cannot be used to set string options. * * Returns 0 on success, -1 in error cases */ int set_option_parameter_int(QEMUOptionParameter *list, const char *name, uint64_t value) { // Find a matching parameter list = get_option_parameter(list, name); if (list == NULL) { fprintf(stderr, "Unknown option '%s'\n", name); return -1; } // Process parameter switch (list->type) { case OPT_FLAG: case OPT_NUMBER: case OPT_SIZE: list->value.n = value; break; default: return -1; } return 0; } /* * Frees a option list. If it contains strings, the strings are freed as well. */ void free_option_parameters(QEMUOptionParameter *list) { QEMUOptionParameter *cur = list; while (cur && cur->name) { if (cur->type == OPT_STRING) { qemu_free(cur->value.s); } cur++; } qemu_free(list); } /* * Parses a parameter string (param) into an option list (dest). * * list is the templace is. If dest is NULL, a new copy of list is created for * it. If list is NULL, this function fails. * * A parameter string consists of one or more parameters, separated by commas. * Each parameter consists of its name and possibly of a value. In the latter * case, the value is delimited by an = character. To specify a value which * contains commas, double each comma so it won't be recognized as the end of * the parameter. * * For more details of the parsing see above. * * Returns a pointer to the first element of dest (or the newly allocated copy) * or NULL in error cases */ QEMUOptionParameter *parse_option_parameters(const char *param, QEMUOptionParameter *list, QEMUOptionParameter *dest) { QEMUOptionParameter *cur; QEMUOptionParameter *allocated = NULL; char name[256]; char value[256]; char *param_delim, *value_delim; char next_delim; size_t num_options; if (list == NULL) { return NULL; } if (dest == NULL) { // Count valid options num_options = 0; cur = list; while (cur->name) { num_options++; cur++; } // Create a copy of the option list to fill in values dest = qemu_mallocz((num_options + 1) * sizeof(QEMUOptionParameter)); allocated = dest; memcpy(dest, list, (num_options + 1) * sizeof(QEMUOptionParameter)); } while (*param) { // Find parameter name and value in the string param_delim = strchr(param, ','); value_delim = strchr(param, '='); if (value_delim && (value_delim < param_delim || !param_delim)) { next_delim = '='; } else { next_delim = ','; value_delim = NULL; } param = get_opt_name(name, sizeof(name), param, next_delim); if (value_delim) { param = get_opt_value(value, sizeof(value), param + 1); } if (*param != '\0') { param++; } // Set the parameter if (set_option_parameter(dest, name, value_delim ? value : NULL)) { goto fail; } } return dest; fail: // Only free the list if it was newly allocated free_option_parameters(allocated); return NULL; } /* * Prints all options of a list that have a value to stdout */ void print_option_parameters(QEMUOptionParameter *list) { while (list && list->name) { switch (list->type) { case OPT_STRING: if (list->value.s != NULL) { printf("%s='%s' ", list->name, list->value.s); } break; case OPT_FLAG: printf("%s=%s ", list->name, list->value.n ? "on" : "off"); break; case OPT_SIZE: case OPT_NUMBER: printf("%s=%" PRId64 " ", list->name, list->value.n); break; default: printf("%s=(unkown type) ", list->name); break; } list++; } } /* * Prints an overview of all available options */ void print_option_help(QEMUOptionParameter *list) { printf("Supported options:\n"); while (list && list->name) { printf("%-16s %s\n", list->name, list->help ? list->help : "No description available"); list++; } } /* ------------------------------------------------------------------ */ struct QemuOpt { const char *name; const char *str; QemuOptDesc *desc; union { int bool; uint64_t uint; } value; QemuOpts *opts; TAILQ_ENTRY(QemuOpt) next; }; struct QemuOpts { const char *id; QemuOptsList *list; TAILQ_HEAD(, QemuOpt) head; TAILQ_ENTRY(QemuOpts) next; }; static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name) { QemuOpt *opt; TAILQ_FOREACH(opt, &opts->head, next) { if (strcmp(opt->name, name) != 0) continue; return opt; } return NULL; } const char *qemu_opt_get(QemuOpts *opts, const char *name) { QemuOpt *opt = qemu_opt_find(opts, name); return opt ? opt->str : NULL; } int qemu_opt_get_bool(QemuOpts *opts, const char *name, int defval) { QemuOpt *opt = qemu_opt_find(opts, name); if (opt == NULL) return defval; assert(opt->desc && opt->desc->type == QEMU_OPT_BOOL); return opt->value.bool; } uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval) { QemuOpt *opt = qemu_opt_find(opts, name); if (opt == NULL) return defval; assert(opt->desc && opt->desc->type == QEMU_OPT_NUMBER); return opt->value.uint; } uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval) { QemuOpt *opt = qemu_opt_find(opts, name); if (opt == NULL) return defval; assert(opt->desc && opt->desc->type == QEMU_OPT_SIZE); return opt->value.uint; } static int qemu_opt_parse(QemuOpt *opt) { if (opt->desc == NULL) return 0; switch (opt->desc->type) { case QEMU_OPT_STRING: /* nothing */ return 0; case QEMU_OPT_BOOL: return parse_option_bool(opt->name, opt->str, &opt->value.bool); case QEMU_OPT_NUMBER: return parse_option_number(opt->name, opt->str, &opt->value.uint); case QEMU_OPT_SIZE: return parse_option_size(opt->name, opt->str, &opt->value.uint); default: abort(); } } static void qemu_opt_del(QemuOpt *opt) { TAILQ_REMOVE(&opt->opts->head, opt, next); qemu_free((/* !const */ char*)opt->name); qemu_free((/* !const */ char*)opt->str); qemu_free(opt); } int qemu_opt_set(QemuOpts *opts, const char *name, const char *value) { QemuOpt *opt; opt = qemu_opt_find(opts, name); if (!opt) { QemuOptDesc *desc = opts->list->desc; int i; for (i = 0; desc[i].name != NULL; i++) { if (strcmp(desc[i].name, name) == 0) { break; } } if (desc[i].name == NULL) { if (i == 0) { /* empty list -> allow any */; } else { fprintf(stderr, "option \"%s\" is not valid for %s\n", name, opts->list->name); return -1; } } opt = qemu_mallocz(sizeof(*opt)); opt->name = qemu_strdup(name); opt->opts = opts; TAILQ_INSERT_TAIL(&opts->head, opt, next); if (desc[i].name != NULL) { opt->desc = desc+i; } } qemu_free((/* !const */ char*)opt->str); opt->str = NULL; if (value) { opt->str = qemu_strdup(value); } if (qemu_opt_parse(opt) < 0) { fprintf(stderr, "Failed to parse \"%s\" for \"%s.%s\"\n", opt->str, opts->list->name, opt->name); qemu_opt_del(opt); return -1; } return 0; } int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque, int abort_on_failure) { QemuOpt *opt; int rc = 0; TAILQ_FOREACH(opt, &opts->head, next) { rc = func(opt->name, opt->str, opaque); if (abort_on_failure && rc != 0) break; } return rc; } QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id) { QemuOpts *opts; TAILQ_FOREACH(opts, &list->head, next) { if (!opts->id) { continue; } if (strcmp(opts->id, id) != 0) { continue; } return opts; } return NULL; } QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id, int fail_if_exists) { QemuOpts *opts = NULL; if (id) { opts = qemu_opts_find(list, id); if (opts != NULL) { if (fail_if_exists) { fprintf(stderr, "tried to create id \"%s\" twice for \"%s\"\n", id, list->name); return NULL; } else { return opts; } } } opts = qemu_mallocz(sizeof(*opts)); if (id) { opts->id = qemu_strdup(id); } opts->list = list; TAILQ_INIT(&opts->head); TAILQ_INSERT_TAIL(&list->head, opts, next); return opts; } int qemu_opts_set(QemuOptsList *list, const char *id, const char *name, const char *value) { QemuOpts *opts; opts = qemu_opts_create(list, id, 1); if (opts == NULL) { fprintf(stderr, "id \"%s\" not found for \"%s\"\n", id, list->name); return -1; } return qemu_opt_set(opts, name, value); } const char *qemu_opts_id(QemuOpts *opts) { return opts->id; } void qemu_opts_del(QemuOpts *opts) { QemuOpt *opt; for (;;) { opt = TAILQ_FIRST(&opts->head); if (opt == NULL) break; qemu_opt_del(opt); } TAILQ_REMOVE(&opts->list->head, opts, next); qemu_free(opts); } int qemu_opts_print(QemuOpts *opts, void *dummy) { QemuOpt *opt; fprintf(stderr, "%s: %s:", opts->list->name, opts->id ? opts->id : "<noid>"); TAILQ_FOREACH(opt, &opts->head, next) { fprintf(stderr, " %s=\"%s\"", opt->name, opt->str); } fprintf(stderr, "\n"); return 0; } QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, const char *firstname) { char option[128], value[128], *id = NULL; QemuOpts *opts; const char *p,*pe,*pc; if (strncmp(params, "id=", 3) == 0) { get_opt_value(value, sizeof(value), params+3); id = qemu_strdup(value); } else if ((p = strstr(params, ",id=")) != NULL) { get_opt_value(value, sizeof(value), p+4); id = qemu_strdup(value); } opts = qemu_opts_create(list, id, 1); if (opts == NULL) return NULL; p = params; for(;;) { pe = strchr(p, '='); pc = strchr(p, ','); if (!pe || (pc && pc < pe)) { /* found "foo,more" */ if (p == params && firstname) { /* implicitly named first option */ pstrcpy(option, sizeof(option), firstname); p = get_opt_value(value, sizeof(value), p); } else { /* option without value, probably a flag */ p = get_opt_name(option, sizeof(option), p, ','); if (strncmp(p, "no", 2) == 0) { memmove(option, option+2, strlen(option+2)+1); pstrcpy(value, sizeof(value), "off"); } else { pstrcpy(value, sizeof(value), "on"); } } } else { /* found "foo=bar,more" */ p = get_opt_name(option, sizeof(option), p, '='); if (*p != '=') { break; } p++; p = get_opt_value(value, sizeof(value), p); } if (strcmp(option, "id") != 0) { /* store and parse */ if (-1 == qemu_opt_set(opts, option, value)) { qemu_opts_del(opts); return NULL; } } if (*p != ',') { break; } p++; } return opts; } int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque, int abort_on_failure) { QemuOpts *opts; int rc = 0; TAILQ_FOREACH(opts, &list->head, next) { rc = func(opts, opaque); if (abort_on_failure && rc != 0) break; } return rc; }