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Diffstat (limited to 'gdb/environ.c')
| -rw-r--r-- | gdb/environ.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/gdb/environ.c b/gdb/environ.c new file mode 100644 index 0000000..4109472 --- /dev/null +++ b/gdb/environ.c @@ -0,0 +1,187 @@ +/* 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#define min(a, b) ((a) < (b) ? (a) : (b)) +#define max(a, b) ((a) > (b) ? (a) : (b)) + +#include "environ.h" +#include <string.h> + +extern char *xmalloc (); +extern char *xrealloc (); +extern void free (); + +/* 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; + + 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 *)); + } + + bcopy (environ, e->vector, (i + 1) * sizeof (char *)); + + while (--i >= 0) + { + register int len = strlen (e->vector[i]); + register char *new = (char *) xmalloc (len + 1); + bcopy (e->vector[i], new, 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) + struct environ *e; + char *var; +{ + register int len = strlen (var); + register char **vector = e->vector; + register char *s; + + for (; s = *vector; vector++) + if (!strncmp (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; + char *var; + char *value; +{ + register int i; + register int len = strlen (var); + register char **vector = e->vector; + register char *s; + + for (i = 0; s = vector[i]; i++) + if (!strncmp (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; + + /* Certain variables get exported back to the parent (e.g. our) + environment, too. */ + if (!strcmp(var, "PATH") /* Object file location */ + || !strcmp (var, "G960BASE") /* Intel 960 downloads */ + || !strcmp (var, "G960BIN") /* Intel 960 downloads */ + ) { + putenv (strsave (s)); + } + 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; vector++) + if (!strncmp (s, var, len) + && s[len] == '=') + { + free (s); + bcopy (vector + 1, vector, + (e->allocated - (vector - e->vector)) * sizeof (char *)); + e->vector[e->allocated - 1] = 0; + return; + } +} |