/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <assert.h> #include <stdlib.h> #include <stdarg.h> #include <string.h> #include <errno.h> #include "util.h" #include "strv.h" char *strv_find(char **l, const char *name) { char **i; assert(name); STRV_FOREACH(i, l) if (streq(*i, name)) return *i; return NULL; } char *strv_find_prefix(char **l, const char *name) { char **i; assert(name); STRV_FOREACH(i, l) if (startswith(*i, name)) return *i; return NULL; } void strv_free(char **l) { char **k; if (!l) return; for (k = l; *k; k++) free(*k); free(l); } char **strv_copy(char **l) { char **r, **k; k = r = new(char*, strv_length(l)+1); if (!k) return NULL; if (l) for (; *l; k++, l++) if (!(*k = strdup(*l))) goto fail; *k = NULL; return r; fail: for (k--; k >= r; k--) free(*k); free(r); return NULL; } unsigned strv_length(char **l) { unsigned n = 0; if (!l) return 0; for (; *l; l++) n++; return n; } char **strv_new_ap(const char *x, va_list ap) { const char *s; char **a; unsigned n = 0, i = 0; va_list aq; /* As a special trick we ignore all listed strings that equal * (const char*) -1. This is supposed to be used with the * STRV_IFNOTNULL() macro to include possibly NULL strings in * the string list. */ if (x) { n = x == (const char*) -1 ? 0 : 1; va_copy(aq, ap); while ((s = va_arg(aq, const char*))) { if (s == (const char*) -1) continue; n++; } va_end(aq); } a = new(char*, n+1); if (!a) return NULL; if (x) { if (x != (const char*) -1) { a[i] = strdup(x); if (!a[i]) goto fail; i++; } while ((s = va_arg(ap, const char*))) { if (s == (const char*) -1) continue; a[i] = strdup(s); if (!a[i]) goto fail; i++; } } a[i] = NULL; return a; fail: for (; i > 0; i--) if (a[i-1]) free(a[i-1]); free(a); return NULL; } char **strv_new(const char *x, ...) { char **r; va_list ap; va_start(ap, x); r = strv_new_ap(x, ap); va_end(ap); return r; } char **strv_merge(char **a, char **b) { char **r, **k; if (!a) return strv_copy(b); if (!b) return strv_copy(a); r = new(char*, strv_length(a) + strv_length(b) + 1); if (!r) return NULL; for (k = r; *a; k++, a++) { *k = strdup(*a); if (!*k) goto fail; } for (; *b; k++, b++) { *k = strdup(*b); if (!*k) goto fail; } *k = NULL; return r; fail: strv_free(r); return NULL; } char **strv_merge_concat(char **a, char **b, const char *suffix) { char **r, **k; /* Like strv_merge(), but appends suffix to all strings in b, before adding */ if (!b) return strv_copy(a); r = new(char*, strv_length(a) + strv_length(b) + 1); if (!r) return NULL; k = r; if (a) for (; *a; k++, a++) { *k = strdup(*a); if (!*k) goto fail; } for (; *b; k++, b++) { *k = strappend(*b, suffix); if (!*k) goto fail; } *k = NULL; return r; fail: strv_free(r); return NULL; } char **strv_split(const char *s, const char *separator) { char *state; char *w; size_t l; unsigned n, i; char **r; assert(s); n = 0; FOREACH_WORD_SEPARATOR(w, l, s, separator, state) n++; if (!(r = new(char*, n+1))) return NULL; i = 0; FOREACH_WORD_SEPARATOR(w, l, s, separator, state) if (!(r[i++] = strndup(w, l))) { strv_free(r); return NULL; } r[i] = NULL; return r; } char **strv_split_quoted(const char *s) { char *state; char *w; size_t l; unsigned n, i; char **r; assert(s); n = 0; FOREACH_WORD_QUOTED(w, l, s, state) n++; if (!(r = new(char*, n+1))) return NULL; i = 0; FOREACH_WORD_QUOTED(w, l, s, state) if (!(r[i++] = cunescape_length(w, l))) { strv_free(r); return NULL; } r[i] = NULL; return r; } char *strv_join(char **l, const char *separator) { char *r, *e; char **s; size_t n, k; if (!separator) separator = " "; k = strlen(separator); n = 0; STRV_FOREACH(s, l) { if (n != 0) n += k; n += strlen(*s); } if (!(r = new(char, n+1))) return NULL; e = r; STRV_FOREACH(s, l) { if (e != r) e = stpcpy(e, separator); e = stpcpy(e, *s); } *e = 0; return r; } char **strv_append(char **l, const char *s) { char **r, **k; if (!l) return strv_new(s, NULL); if (!s) return strv_copy(l); r = new(char*, strv_length(l)+2); if (!r) return NULL; for (k = r; *l; k++, l++) if (!(*k = strdup(*l))) goto fail; if (!(*(k++) = strdup(s))) goto fail; *k = NULL; return r; fail: for (k--; k >= r; k--) free(*k); free(r); return NULL; } char **strv_uniq(char **l) { char **i; /* Drops duplicate entries. The first identical string will be * kept, the others dropped */ STRV_FOREACH(i, l) strv_remove(i+1, *i); return l; } char **strv_remove(char **l, const char *s) { char **f, **t; if (!l) return NULL; assert(s); /* Drops every occurrence of s in the string list, edits * in-place. */ for (f = t = l; *f; f++) { if (streq(*f, s)) { free(*f); continue; } *(t++) = *f; } *t = NULL; return l; } char **strv_remove_prefix(char **l, const char *s) { char **f, **t; if (!l) return NULL; assert(s); /* Drops every occurrence of a string prefixed with s in the * string list, edits in-place. */ for (f = t = l; *f; f++) { if (startswith(*f, s)) { free(*f); continue; } *(t++) = *f; } *t = NULL; return l; } static int env_append(char **r, char ***k, char **a) { assert(r); assert(k); if (!a) return 0; /* Add the entries of a to *k unless they already exist in *r * in which case they are overridden instead. This assumes * there is enough space in the r array. */ for (; *a; a++) { char **j; size_t n; n = strcspn(*a, "="); if ((*a)[n] == '=') n++; for (j = r; j < *k; j++) if (strncmp(*j, *a, n) == 0) break; if (j >= *k) (*k)++; else free(*j); if (!(*j = strdup(*a))) return -ENOMEM; } return 0; } char **strv_env_merge(unsigned n_lists, ...) { size_t n = 0; char **l, **k, **r; va_list ap; unsigned i; /* Merges an arbitrary number of environment sets */ va_start(ap, n_lists); for (i = 0; i < n_lists; i++) { l = va_arg(ap, char**); n += strv_length(l); } va_end(ap); if (!(r = new(char*, n+1))) return NULL; k = r; va_start(ap, n_lists); for (i = 0; i < n_lists; i++) { l = va_arg(ap, char**); if (env_append(r, &k, l) < 0) goto fail; } va_end(ap); *k = NULL; return r; fail: va_end(ap); for (k--; k >= r; k--) free(*k); free(r); return NULL; } static bool env_match(const char *t, const char *pattern) { assert(t); assert(pattern); /* pattern a matches string a * a matches a= * a matches a=b * a= matches a= * a=b matches a=b * a= does not match a * a=b does not match a= * a=b does not match a * a=b does not match a=c */ if (streq(t, pattern)) return true; if (!strchr(pattern, '=')) { size_t l = strlen(pattern); return strncmp(t, pattern, l) == 0 && t[l] == '='; } return false; } char **strv_env_delete(char **x, unsigned n_lists, ...) { size_t n, i = 0; char **k, **r; va_list ap; /* Deletes every entry from x that is mentioned in the other * string lists */ n = strv_length(x); r = new(char*, n+1); if (!r) return NULL; STRV_FOREACH(k, x) { unsigned v; va_start(ap, n_lists); for (v = 0; v < n_lists; v++) { char **l, **j; l = va_arg(ap, char**); STRV_FOREACH(j, l) if (env_match(*k, *j)) goto skip; } va_end(ap); r[i] = strdup(*k); if (!r[i]) { strv_free(r); return NULL; } i++; continue; skip: va_end(ap); } r[i] = NULL; assert(i <= n); return r; } char **strv_env_unset(char **l, const char *p) { char **f, **t; if (!l) return NULL; assert(p); /* Drops every occurrence of the env var setting p in the * string list. edits in-place. */ for (f = t = l; *f; f++) { if (env_match(*f, p)) { free(*f); continue; } *(t++) = *f; } *t = NULL; return l; } char **strv_env_set(char **x, const char *p) { char **k, **r; char* m[2] = { (char*) p, NULL }; /* Overrides the env var setting of p, returns a new copy */ if (!(r = new(char*, strv_length(x)+2))) return NULL; k = r; if (env_append(r, &k, x) < 0) goto fail; if (env_append(r, &k, m) < 0) goto fail; *k = NULL; return r; fail: for (k--; k >= r; k--) free(*k); free(r); return NULL; } char *strv_env_get_with_length(char **l, const char *name, size_t k) { char **i; assert(name); STRV_FOREACH(i, l) if (strncmp(*i, name, k) == 0 && (*i)[k] == '=') return *i + k + 1; return NULL; } char *strv_env_get(char **l, const char *name) { return strv_env_get_with_length(l, name, strlen(name)); } char **strv_env_clean(char **l) { char **r, **ret; for (r = ret = l; *l; l++) { const char *equal; equal = strchr(*l, '='); if (equal && equal[1] == 0) { free(*l); continue; } *(r++) = *l; } *r = NULL; return ret; } char **strv_parse_nulstr(const char *s, size_t l) { const char *p; unsigned c = 0, i = 0; char **v; assert(s || l <= 0); if (l <= 0) return strv_new(NULL, NULL); for (p = s; p < s + l; p++) if (*p == 0) c++; if (s[l-1] != 0) c++; if (!(v = new0(char*, c+1))) return NULL; p = s; while (p < s + l) { const char *e; e = memchr(p, 0, s + l - p); if (!(v[i++] = strndup(p, e ? e - p : s + l - p))) { strv_free(v); return NULL; } if (!e) break; p = e + 1; } assert(i == c); return v; } bool strv_overlap(char **a, char **b) { char **i, **j; STRV_FOREACH(i, a) { STRV_FOREACH(j, b) { if (streq(*i, *j)) return true; } } return false; }