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- #include <sys/param.h>
- #include <sys/file.h>
- #include <sys/stat.h>
- #include <stdio.h>
- #include <stdio_ext.h>
- #include <ctype.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <paths.h>
- #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
- libc_hidden_proto(fstat)
- libc_hidden_proto(fopen)
- libc_hidden_proto(fclose)
- libc_hidden_proto(__fsetlocking)
- libc_hidden_proto(fileno)
- libc_hidden_proto(fgets_unlocked)
- #ifdef __UCLIBC_HAS_XLOCALE__
- libc_hidden_proto(__ctype_b_loc)
- #elif __UCLIBC_HAS_CTYPE_TABLES__
- libc_hidden_proto(__ctype_b)
- #endif
- static const char * const validsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
- static char **curshell, **shells, *strings;
- static char **initshells __P((void));
- char * getusershell(void)
- {
- char *ret;
- if (curshell == NULL)
- curshell = initshells();
- ret = *curshell;
- if (ret != NULL)
- curshell++;
- return (ret);
- }
- static void __free_initshell_memory(void)
- {
- if (shells != NULL) {
- free(shells);
- }
- shells = NULL;
- if (strings != NULL) {
- free(strings);
- }
- strings = NULL;
- }
- void endusershell(void)
- {
- __free_initshell_memory();
- curshell = NULL;
- }
- void setusershell(void)
- {
- curshell = initshells();
- }
- static char ** initshells(void)
- {
- register char **sp, *cp;
- register FILE *fp;
- struct stat statb;
- int flen;
- __free_initshell_memory();
- if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
- return (char **) validsh;
- if (fstat(fileno(fp), &statb) == -1) {
- goto cleanup;
- }
- if ((strings = malloc((unsigned)statb.st_size + 1)) == NULL) {
- goto cleanup;
- }
- if ((shells = calloc((unsigned)statb.st_size / 3, sizeof (char *))) == NULL) {
- goto cleanup;
- }
-
- #ifdef __UCLIBC_HAS_THREADS__
- __fsetlocking (fp, FSETLOCKING_BYCALLER);
- #endif
- sp = shells;
- cp = strings;
- flen = statb.st_size;
- while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) {
- while (*cp != '#' && *cp != '/' && *cp != '\0')
- cp++;
- if (*cp == '#' || *cp == '\0')
- continue;
- *sp++ = cp;
- while (!isspace(*cp) && *cp != '#' && *cp != '\0')
- cp++;
- *cp++ = '\0';
- }
- *sp = NULL;
- fclose(fp);
- return (shells);
- cleanup:
- __free_initshell_memory();
- fclose(fp);
- return (char **) validsh;
- }
- #endif
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