1 /* Copyright 1988,1990,1993,1994 by Paul Vixie 2 * All rights reserved 3 * 4 * Distribute freely, except: don't remove my name from the source or 5 * documentation (don't take credit for my work), mark your changes (don't 6 * get me blamed for your possible bugs), don't alter or remove this 7 * notice. May be sold if buildable source is provided to buyer. No 8 * warrantee of any kind, express or implied, is included with this 9 * software; use at your own risk, responsibility for damages (if any) to 10 * anyone resulting from the use of this software rests entirely with the 11 * user. 12 * 13 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and 14 * I'll try to keep a version up to date. I can be reached as follows: 15 * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul 16 */ 17 18 #if !defined(lint) && !defined(LINT) 19 static char rcsid[] = "$Id: env.c,v 1.5 1998/03/30 06:59:44 deraadt Exp $"; 20 #endif 21 22 23 #include "cron.h" 24 25 26 char ** 27 env_init() 28 { 29 register char **p = (char **) malloc(sizeof(char **)); 30 31 if (p) 32 p[0] = NULL; 33 return (p); 34 } 35 36 37 void 38 env_free(envp) 39 char **envp; 40 { 41 char **p; 42 43 for (p = envp; *p; p++) 44 free(*p); 45 free(envp); 46 } 47 48 49 char ** 50 env_copy(envp) 51 register char **envp; 52 { 53 register int count, i; 54 register char **p; 55 56 for (count = 0; envp[count] != NULL; count++) 57 ; 58 p = (char **) malloc((count+1) * sizeof(char *)); /* 1 for the NULL */ 59 if (p == NULL) { 60 errno = ENOMEM; 61 return NULL; 62 } 63 for (i = 0; i < count; i++) 64 if ((p[i] = strdup(envp[i])) == NULL) { 65 while (--i >= 0) 66 (void) free(p[i]); 67 free(p); 68 errno = ENOMEM; 69 return NULL; 70 } 71 p[count] = NULL; 72 return (p); 73 } 74 75 76 char ** 77 env_set(envp, envstr) 78 char **envp; 79 char *envstr; 80 { 81 register int count, found; 82 register char **p; 83 84 /* 85 * count the number of elements, including the null pointer; 86 * also set 'found' to -1 or index of entry if already in here. 87 */ 88 found = -1; 89 for (count = 0; envp[count] != NULL; count++) { 90 if (!strcmp_until(envp[count], envstr, '=')) 91 found = count; 92 } 93 count++; /* for the NULL */ 94 95 if (found != -1) { 96 /* 97 * it exists already, so just free the existing setting, 98 * save our new one there, and return the existing array. 99 */ 100 free(envp[found]); 101 if ((envp[found] = strdup(envstr)) == NULL) { 102 envp[found] = ""; 103 errno = ENOMEM; 104 return NULL; 105 } 106 return (envp); 107 } 108 109 /* 110 * it doesn't exist yet, so resize the array, move null pointer over 111 * one, save our string over the old null pointer, and return resized 112 * array. 113 */ 114 p = (char **) realloc((void *) envp, 115 (unsigned) ((count+1) * sizeof(char **))); 116 if (p == NULL) { 117 errno = ENOMEM; 118 return NULL; 119 } 120 p[count] = p[count-1]; 121 if ((p[count-1] = strdup(envstr)) == NULL) { 122 errno = ENOMEM; 123 return NULL; 124 } 125 return (p); 126 } 127 128 129 /* return ERR = end of file 130 * FALSE = not an env setting (file was repositioned) 131 * TRUE = was an env setting 132 */ 133 int 134 load_env(envstr, f) 135 char *envstr; 136 FILE *f; 137 { 138 long filepos; 139 int fileline; 140 char name[MAX_ENVSTR], val[MAX_ENVSTR]; 141 int fields; 142 143 filepos = ftell(f); 144 fileline = LineNumber; 145 skip_comments(f); 146 if (EOF == get_string(envstr, MAX_ENVSTR, f, "\n")) 147 return (ERR); 148 149 Debug(DPARS, ("load_env, read <%s>\n", envstr)) 150 151 name[0] = val[0] = '\0'; 152 fields = sscanf(envstr, "%[^ =] = %[^\n#]", name, val); 153 if (fields != 2) { 154 Debug(DPARS, ("load_env, not 2 fields (%d)\n", fields)) 155 fseek(f, filepos, 0); 156 Set_LineNum(fileline); 157 return (FALSE); 158 } 159 160 /* 2 fields from scanf; looks like an env setting 161 */ 162 163 /* 164 * process value string 165 */ 166 /*local*/{ 167 int len = strdtb(val); 168 169 if (len >= 2) { 170 if (val[0] == '\'' || val[0] == '"') { 171 if (val[len-1] == val[0]) { 172 val[len-1] = '\0'; 173 (void) strcpy(val, val+1); 174 } 175 } 176 } 177 } 178 179 if (strlen(name) + 1 + strlen(val) >= MAX_ENVSTR-1) 180 return (FALSE); 181 (void) sprintf(envstr, "%s=%s", name, val); 182 Debug(DPARS, ("load_env, <%s> <%s> -> <%s>\n", name, val, envstr)) 183 return (TRUE); 184 } 185 186 187 char * 188 env_get(name, envp) 189 register char *name; 190 register char **envp; 191 { 192 register int len = strlen(name); 193 register char *p, *q; 194 195 while ((p = *envp++) != NULL) { 196 if (!(q = strchr(p, '='))) 197 continue; 198 if ((q - p) == len && !strncmp(p, name, len)) 199 return (q+1); 200 } 201 return (NULL); 202 } 203