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Diffstat (limited to 'gdb/environ.c')
| -rw-r--r-- | gdb/environ.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/gdb/environ.c b/gdb/environ.c new file mode 100644 index 00000000000..77296bef2a4 --- /dev/null +++ b/gdb/environ.c @@ -0,0 +1,194 @@ +/* environ.c -- library for manipulating environments for GNU. + Copyright (C) 1986, 1989 Free Software Foundation, Inc. + +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 2 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, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#define min(a, b) ((a) < (b) ? (a) : (b)) +#define max(a, b) ((a) > (b) ? (a) : (b)) + +#include "defs.h" +#include "environ.h" +#include "gdb_string.h" +#include "gdbcore.h" + + +/* Return a new environment object. */ + +struct environ * +make_environ () +{ + register struct environ *e; + + e = (struct environ *) xmalloc (sizeof (struct environ)); + + e->allocated = 10; + e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *)); + e->vector[0] = 0; + return e; +} + +/* Free an environment and all the strings in it. */ + +void +free_environ (e) + register struct environ *e; +{ + register char **vector = e->vector; + + while (*vector) + free (*vector++); + + free (e); +} + +/* Copy the environment given to this process into E. + Also copies all the strings in it, so we can be sure + that all strings in these environments are safe to free. */ + +void +init_environ (e) + register struct environ *e; +{ + extern char **environ; + register int i; + + if (environ == NULL) + return; + + for (i = 0; environ[i]; i++) /*EMPTY*/; + + if (e->allocated < i) + { + e->allocated = max (i, e->allocated + 10); + e->vector = (char **) xrealloc ((char *)e->vector, + (e->allocated + 1) * sizeof (char *)); + } + + memcpy (e->vector, environ, (i + 1) * sizeof (char *)); + + while (--i >= 0) + { + register int len = strlen (e->vector[i]); + register char *new = (char *) xmalloc (len + 1); + memcpy (new, e->vector[i], len + 1); + e->vector[i] = new; + } +} + +/* Return the vector of environment E. + This is used to get something to pass to execve. */ + +char ** +environ_vector (e) + struct environ *e; +{ + return e->vector; +} + +/* Return the value in environment E of variable VAR. */ + +char * +get_in_environ (e, var) + const struct environ *e; + const char *var; +{ + register int len = strlen (var); + register char **vector = e->vector; + register char *s; + + for (; (s = *vector) != NULL; vector++) + if (STREQN (s, var, len) && s[len] == '=') + return &s[len + 1]; + + return 0; +} + +/* Store the value in E of VAR as VALUE. */ + +void +set_in_environ (e, var, value) + struct environ *e; + const char *var; + const char *value; +{ + register int i; + register int len = strlen (var); + register char **vector = e->vector; + register char *s; + + for (i = 0; (s = vector[i]) != NULL; i++) + if (STREQN (s, var, len) && s[len] == '=') + break; + + if (s == 0) + { + if (i == e->allocated) + { + e->allocated += 10; + vector = (char **) xrealloc ((char *)vector, + (e->allocated + 1) * sizeof (char *)); + e->vector = vector; + } + vector[i + 1] = 0; + } + else + free (s); + + s = (char *) xmalloc (len + strlen (value) + 2); + strcpy (s, var); + strcat (s, "="); + strcat (s, value); + vector[i] = s; + + /* This used to handle setting the PATH and GNUTARGET variables + specially. The latter has been replaced by "set gnutarget" + (which has worked since GDB 4.11). The former affects searching + the PATH to find SHELL, and searching the PATH to find the + argument of "symbol-file" or "exec-file". Maybe we should have + some kind of "set exec-path" for that. But in any event, having + "set env" affect anything besides the inferior is a bad idea. + What if we want to change the environment we pass to the program + without afecting GDB's behavior? */ + + return; +} + +/* Remove the setting for variable VAR from environment E. */ + +void +unset_in_environ (e, var) + struct environ *e; + char *var; +{ + register int len = strlen (var); + register char **vector = e->vector; + register char *s; + + for (; (s = *vector) != NULL; vector++) + { + if (STREQN (s, var, len) && s[len] == '=') + { + free (s); + /* Walk through the vector, shuffling args down by one, including + the NULL terminator. Can't use memcpy() here since the regions + overlap, and memmove() might not be available. */ + while ((vector[0] = vector[1]) != NULL) + { + vector++; + } + break; + } + } +} |