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-rw-r--r--include/stdlib.h40
-rw-r--r--src/stdlib/abspath.c106
-rw-r--r--src/stdlib/relpath.c98
3 files changed, 244 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h
index 89712f9..eca92b2 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -93,6 +93,46 @@ lldiv_t lldiv(long long, long long)
__GCC_ONLY(__attribute__((const)));
+#if !defined(__PORTABLE)
+/**
+ * Get the absolute path of a file.
+ * It will remove all redundant slashes, all "./":s,
+ * and all "../":s, but not resolve symbolic links.
+ *
+ * This is a slibc extension.
+ *
+ * @param file The file.
+ * @param ref The directory the file's specified path is
+ * relative, `NULL` for the current working directory.
+ * @return The file's absolute pathname. Will end with a slash
+ * if `file` does. (Or if `ref` does but file is empty.)
+ *
+ * @throws ENOMEM The process cannot allocate more memory.
+ */
+char* abspath(const char*, const char*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull(1), malloc)));
+
+/**
+ * Get the relative path of a file.
+ *
+ * This is a slibc extension.
+ *
+ * @param file The file.
+ * @param ref The file the result shall be relative to,
+ * `NULL` for the current working directory.
+ * If and only if this path ends with a slash,
+ * (or if it is `NULL`,) it will be treated as
+ * a directory in which a symbolic link, with
+ * the result as it target, can be located to
+ * point to `file`.
+ *
+ * @throws ENOMEM The process cannot allocate more memory.
+ */
+char* relpath(const char*, const char*)
+ __GCC_ONLY(__attribute__((warn_unused_result, nonnull(1), malloc)));
+#endif
+
+
/* TODO implement rand-functions */
#define RAND_MAX 1
diff --git a/src/stdlib/abspath.c b/src/stdlib/abspath.c
new file mode 100644
index 0000000..a0f0871
--- /dev/null
+++ b/src/stdlib/abspath.c
@@ -0,0 +1,106 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+
+
+/**
+ * Get the absolute path of a file.
+ * It will remove all redundant slashes, all "./":s,
+ * and all "../":s, but not resolve symbolic links.
+ *
+ * This is a slibc extension.
+ *
+ * @param file The file.
+ * @param ref The directory the file's specified path is
+ * relative, `NULL` for the current working directory.
+ * @return The file's absolute pathname. Will end with a slash
+ * if `file` does. (Or if `ref` does but file is empty.)
+ *
+ * @throws ENOMEM The process cannot allocate more memory.
+ */
+char* abspath(const char* file, const char* ref) /* XXX may also fail as get_current_dir_name */
+{
+ char* ref_ = NULL;
+ char* rc;
+ char* rc_;
+ size_t p, q;
+ int saved_errno;
+
+ if (ref == NULL)
+ {
+ ref = ref_ = get_current_dir_name();
+ if (ref == NULL)
+ return NULL;
+ }
+
+ rc = malloc((strlen(file) + strlen(ref) + 3) * sizeof(char));
+ if (rc_ = rc, rc == NULL)
+ {
+ saved_errno = errno;
+ free(ref_);
+ errno = saved_errno;
+ return NULL;
+ }
+
+ /* Create absolute path, with //, /./, and /../. */
+ if (*file != '/')
+ {
+ rc_ = stpcpy(rc_, ref);
+ *rc_++ = '/';
+ }
+ strcpy(rc_, file);
+
+ /* Remove redundant slashes. */
+ p = q = 1;
+ while (rc[p])
+ if ((rc[p] == '/') && (rc[p - 1] == '/'))
+ p++;
+ else
+ rc[q++] = rc[p++];
+ rc[q] = '\0';
+
+ /* Remove ./:s. */
+ p = q = 0;
+ while (rc[p])
+ if ((rc[p] == '/') && (rc[p + 1] == '.') && (rc[p + 2] == '/'))
+ p += 2;
+ else
+ rc[q++] = rc[p++];
+ rc[q] = '\0';
+
+ /* Remove ../:s. */
+ for (;;)
+ {
+ rc_ = strstr(rc, "/../");
+ if (rc_ == NULL)
+ break;
+ memmove(rc_, rc_ + 3, strlen(rc_ + 2) * sizeof(char));
+ if (rc_ == rc)
+ continue;
+ for (p = 0; rc_[-p] != '/'; p++);
+ memmove(rc_ - p, rc_, (strlen(rc_) + 1) * sizeof(char));
+ }
+
+ free(ref_);
+ return rc;
+}
+
diff --git a/src/stdlib/relpath.c b/src/stdlib/relpath.c
new file mode 100644
index 0000000..92888fa
--- /dev/null
+++ b/src/stdlib/relpath.c
@@ -0,0 +1,98 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+
+
+/**
+ * Get the relative path of a file.
+ *
+ * This is a slibc extension.
+ *
+ * @param file The file.
+ * @param ref The file the result shall be relative to,
+ * `NULL` for the current working directory.
+ * If and only if this path ends with a slash,
+ * (or if it is `NULL`,) it will be treated as
+ * a directory in which a symbolic link, with
+ * the result as it target, can be located to
+ * point to `file`.
+ *
+ * @throws ENOMEM The process cannot allocate more memory.
+ */
+char* relpath(const char* file, const char* ref) /* XXX may also fail as get_current_dir_name */
+{
+ int saved_errno;
+ char* cwd = NULL;
+ char* absfile = NULL;
+ char* absref = NULL;
+ char* rc;
+ char* prc;
+ size_t ptr, p, n = 0;
+
+ if ((cwd = get_current_dir_name()) == NULL) goto fail;
+ if ((absfile = abspath(file, cwd)) == NULL) goto fail;
+ if (ref)
+ if ((absref = abspath(ref, cwd)) == NULL) goto fail;
+ if (absref == NULL)
+ {
+ p = strlen(cwd);
+ absref = malloc((p + 1) + sizeof(char));
+ memcpy(absref, cwd, p);
+ absref[p] = '/';
+ absref[p + 1] = '\0';
+ }
+ else
+ strrchr(absref, '/')[1] = '\0';
+
+ ptr = 0;
+ while (absfile[ptr] && (absfile[ptr] == absref[ptr]))
+ ptr++;
+ while (absfile[ptr] != '/')
+ ptr--;
+ ptr++;
+
+ for (p = ptr; absref[p]; p++)
+ if (absref[p] == '/')
+ n += 1;
+
+ rc = malloc((strlen(absfile + ptr) + 1 + 3 * n) * sizeof(char));
+ if (prc = rc, rc == NULL)
+ goto fail;
+
+ while (n--)
+ prc = stpcpy(prc, "../");
+ strcpy(prc, absfile + ptr);
+
+ free(cwd);
+ free(absfile);
+ free(absref);
+ return rc;
+
+ fail:
+ saved_errno = errno;
+ free(cwd);
+ free(absfile);
+ free(absref);
+ errno = saved_errno;
+ return NULL;
+}
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-20 16:43:46 +0000