| 1 | /* Labelled ranges of type IDs. |
| 2 | Copyright (C) 2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of libctf. |
| 5 | |
| 6 | libctf is free software; you can redistribute it and/or modify it under |
| 7 | the terms of the GNU General Public License as published by the Free |
| 8 | Software Foundation; either version 3, or (at your option) any later |
| 9 | version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, but |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 14 | See the GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; see the file COPYING. If not see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <ctf-impl.h> |
| 21 | #include <string.h> |
| 22 | |
| 23 | static int |
| 24 | extract_label_info (ctf_file_t *fp, const ctf_lblent_t **ctl, |
| 25 | uint32_t *num_labels) |
| 26 | { |
| 27 | const ctf_header_t *h; |
| 28 | |
| 29 | h = (const ctf_header_t *) fp->ctf_data.cts_data; |
| 30 | |
| 31 | *ctl = (const ctf_lblent_t *) (fp->ctf_buf + h->cth_lbloff); |
| 32 | *num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t); |
| 33 | |
| 34 | return 0; |
| 35 | } |
| 36 | |
| 37 | /* Returns the topmost label, or NULL if any errors are encountered. */ |
| 38 | |
| 39 | const char * |
| 40 | ctf_label_topmost (ctf_file_t *fp) |
| 41 | { |
| 42 | const ctf_lblent_t *ctlp = NULL; |
| 43 | const char *s; |
| 44 | uint32_t num_labels = 0; |
| 45 | |
| 46 | if (extract_label_info (fp, &ctlp, &num_labels) < 0) |
| 47 | return NULL; /* errno is set for us. */ |
| 48 | |
| 49 | if (num_labels == 0) |
| 50 | { |
| 51 | (void) ctf_set_errno (fp, ECTF_NOLABELDATA); |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | if ((s = ctf_strraw (fp, (ctlp + num_labels - 1)->ctl_label)) == NULL) |
| 56 | (void) ctf_set_errno (fp, ECTF_CORRUPT); |
| 57 | |
| 58 | return s; |
| 59 | } |
| 60 | |
| 61 | /* Iterate over all labels. We pass the label string and the lblinfo_t struct |
| 62 | to the specified callback function. */ |
| 63 | int |
| 64 | ctf_label_iter (ctf_file_t *fp, ctf_label_f *func, void *arg) |
| 65 | { |
| 66 | const ctf_lblent_t *ctlp = NULL; |
| 67 | uint32_t i; |
| 68 | uint32_t num_labels = 0; |
| 69 | ctf_lblinfo_t linfo; |
| 70 | const char *lname; |
| 71 | int rc; |
| 72 | |
| 73 | if (extract_label_info (fp, &ctlp, &num_labels) < 0) |
| 74 | return -1; /* errno is set for us. */ |
| 75 | |
| 76 | if (num_labels == 0) |
| 77 | return (ctf_set_errno (fp, ECTF_NOLABELDATA)); |
| 78 | |
| 79 | for (i = 0; i < num_labels; i++, ctlp++) |
| 80 | { |
| 81 | if ((lname = ctf_strraw (fp, ctlp->ctl_label)) == NULL) |
| 82 | { |
| 83 | ctf_dprintf ("failed to decode label %u with " |
| 84 | "type %u\n", ctlp->ctl_label, ctlp->ctl_type); |
| 85 | return (ctf_set_errno (fp, ECTF_CORRUPT)); |
| 86 | } |
| 87 | |
| 88 | linfo.ctb_type = ctlp->ctl_type; |
| 89 | if ((rc = func (lname, &linfo, arg)) != 0) |
| 90 | return rc; |
| 91 | } |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | typedef struct linfo_cb_arg |
| 97 | { |
| 98 | const char *lca_name; /* Label we want to retrieve info for. */ |
| 99 | ctf_lblinfo_t *lca_info; /* Where to store the info about the label. */ |
| 100 | } linfo_cb_arg_t; |
| 101 | |
| 102 | static int |
| 103 | label_info_cb (const char *lname, const ctf_lblinfo_t *linfo, void *arg) |
| 104 | { |
| 105 | /* If lname matches the label we are looking for, copy the |
| 106 | lblinfo_t struct for the caller. */ |
| 107 | |
| 108 | if (strcmp (lname, ((linfo_cb_arg_t *) arg)->lca_name) == 0) |
| 109 | { |
| 110 | /* * Allow caller not to allocate storage to test if label exists. */ |
| 111 | |
| 112 | if (((linfo_cb_arg_t *) arg)->lca_info != NULL) |
| 113 | memcpy (((linfo_cb_arg_t *) arg)->lca_info, linfo, |
| 114 | sizeof (ctf_lblinfo_t)); |
| 115 | return 1; /* Indicate we found a match. */ |
| 116 | } |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | /* Retrieve information about the label with name "lname". */ |
| 122 | int |
| 123 | ctf_label_info (ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo) |
| 124 | { |
| 125 | linfo_cb_arg_t cb_arg; |
| 126 | int rc; |
| 127 | |
| 128 | cb_arg.lca_name = lname; |
| 129 | cb_arg.lca_info = linfo; |
| 130 | |
| 131 | if ((rc = ctf_label_iter (fp, label_info_cb, &cb_arg)) < 0) |
| 132 | return rc; |
| 133 | |
| 134 | if (rc != 1) |
| 135 | return (ctf_set_errno (fp, ECTF_NOLABEL)); |
| 136 | |
| 137 | return 0; |
| 138 | } |