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79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
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/* Two PD getcwd() implementations.
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Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_GETWD
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/* Version for BSD systems -- use getwd() */
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 1024
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#endif
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extern char *getwd(char *);
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char *
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getcwd(char *buf, int size)
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{
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char localbuf[MAXPATHLEN+1];
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char *ret;
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if (size <= 0) {
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errno = EINVAL;
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return NULL;
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}
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ret = getwd(localbuf);
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if (ret != NULL && strlen(localbuf) >= (size_t)size) {
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errno = ERANGE;
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return NULL;
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}
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if (ret == NULL) {
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errno = EACCES; /* Most likely error */
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return NULL;
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}
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strncpy(buf, localbuf, size);
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return buf;
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}
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#else /* !HAVE_GETWD */
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/* Version for really old UNIX systems -- use pipe from pwd */
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#ifndef PWD_CMD
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#define PWD_CMD "/bin/pwd"
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#endif
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char *
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getcwd(char *buf, int size)
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{
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FILE *fp;
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char *p;
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int sts;
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if (size <= 0) {
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errno = EINVAL;
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return NULL;
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}
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if ((fp = popen(PWD_CMD, "r")) == NULL)
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return NULL;
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if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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errno = EACCES; /* Most likely error */
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return NULL;
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}
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for (p = buf; *p != '\n'; p++) {
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if (*p == '\0') {
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errno = ERANGE;
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return NULL;
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}
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}
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*p = '\0';
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return buf;
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}
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#endif /* !HAVE_GETWD */
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