/*-*- Mode: C; c-basic-offset: 8 -*-*/ /*** 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 General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU 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(l); assert(name); STRV_FOREACH(i, l) if (streq(*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; if (!(r = new(char*, strv_length(l)+1))) return NULL; for (k = r; *l; k++, l++) if (!(*k = strdup(*l))) goto fail; *k = NULL; return r; fail: for (k--, l--; k >= r; k--, l--) free(*k); 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; if (x) { n = 1; va_copy(aq, ap); while (va_arg(aq, const char*)) n++; va_end(aq); } if (!(a = new(char*, n+1))) return NULL; if (x) { if (!(a[i] = strdup(x))) { free(a); return NULL; } i++; while ((s = va_arg(ap, const char*))) { if (!(a[i] = strdup(s))) 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); if (!(r = new(char*, strv_length(a)+strv_length(b)+1))) return NULL; for (k = r; *a; k++, a++) if (!(*k = strdup(*a))) goto fail; for (; *b; k++, b++) if (!(*k = strdup(*b))) goto fail; *k = NULL; return r; fail: for (k--; k >= r; k--) free(*k); 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); if (!(r = new(char*, strv_length(a)+strv_length(b)+1))) return NULL; for (k = r; *a; k++, a++) if (!(*k = strdup(*a))) goto fail; for (; *b; k++, b++) if (!(*k = strappend(*b, suffix))) goto fail; *k = NULL; return r; fail: for (k--; k >= r; k--) free(*k); 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++] = strndup(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); if (!(r = new(char*, strv_length(l)+2))) 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; /* Drops every occurence of s in the string list */ for (f = t = l; *f; f++) { if (streq(*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); assert(a); /* Add the entries of a to *k unless they already exist in *r * in which case they are overriden instead. This assumes * there is enough space in the r */ for (; *a; a++) { char **j; size_t n = strcspn(*a, "=") + 1; 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(char **x, ...) { size_t n = 0; char **l, **k, **r; va_list ap; /* Merges an arbitrary number of environment sets */ if (x) { n += strv_length(x); va_start(ap, x); while ((l = va_arg(ap, char**))) n += strv_length(l); va_end(ap); } if (!(r = new(char*, n+1))) return NULL; k = r; if (x) { if (env_append(r, &k, x) < 0) goto fail; va_start(ap, x); while ((l = va_arg(ap, char**))) if (env_append(r, &k, l) < 0) goto fail; va_end(ap); } *k = NULL; return r; fail: 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, ...) { size_t n = 0, i = 0; char **l, **k, **r, **j; va_list ap; /* Deletes every entry fromx that is mentioned in the other * string lists */ n = strv_length(x); if (!(r = new(char*, n+1))) return NULL; STRV_FOREACH(k, x) { va_start(ap, x); while ((l = va_arg(ap, char**))) STRV_FOREACH(j, l) if (env_match(*k, *j)) goto delete; va_end(ap); if (!(r[i++] = strdup(*k))) { strv_free(r); return NULL; } continue; delete: va_end(ap); } r[i] = NULL; assert(i <= n); return r; }