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#include "spm.h"
int replace_text(char *data, const char *spattern, const char *sreplacement) {
char *tmp = data;
size_t data_len = strlen(data);
size_t spattern_len = strlen(spattern);
size_t sreplacement_len = strlen(sreplacement);
if (sreplacement_len > spattern_len) {
fprintf(stderr, "replacement string too long\n");
return -1;
}
while (*tmp != '\0') {
if (strncmp(tmp, spattern, spattern_len) == 0) {
memmove(tmp, sreplacement, sreplacement_len);
memmove(tmp + sreplacement_len, tmp + spattern_len, data_len - spattern_len);
}
tmp++;
}
return 0;
}
/**
* Replace all occurrences of `oldstr` in file `path` with `newstr`
* @param filename
* @param oldstr
* @param newstr
* @return success=0, failure=-1, or value of `ferror()`
*/
int file_replace_text(char *filename, const char *spattern, const char *sreplacement) {
char data[BUFSIZ];
char tempfile[PATH_MAX];
FILE *fp = NULL;
if ((fp = fopen(filename, "r")) == NULL) {
perror(filename);
return -1;
}
sprintf(tempfile, "%s.spmfrt", filename);
FILE *tfp = NULL;
if ((tfp = fopen(tempfile, "w+")) == NULL) {
perror(tempfile);
return -1;
}
// Zero the data buffer
memset(data, '\0', BUFSIZ);
while(fgets(data, BUFSIZ, fp) != NULL) {
replace_text(data, spattern, sreplacement);
fprintf(tfp, "%s", data);
}
fclose(fp);
rewind(tfp);
// Truncate the original file
if ((fp = fopen(filename, "w+")) == NULL) {
perror(filename);
return -1;
}
// Zero the data buffer once more
memset(data, '\0', BUFSIZ);
// Dump the contents of the temporary file into the original file
while(fgets(data, BUFSIZ, tfp) != NULL) {
fprintf(fp, "%s", data);
}
fclose(fp);
fclose(tfp);
// Remove temporary file
unlink(tempfile);
return 0;
}
/**
* Free memory allocated by `prefixes_read` function
* @param entry array of RelocationEntry
*/
void prefixes_free(RelocationEntry **entry) {
if (!entry) {
return;
}
for (int i = 0; entry[i] != NULL; i++) {
if (entry[i]->prefix) free(entry[i]->prefix);
if (entry[i]->path) free(entry[i]->path);
if (entry[i]) free(entry[i]);
}
free(entry);
}
/**
* Parse a prefix file
*
* The file format is as follows:
*
* ~~~
* #prefix
* path
* #prefix
* path
* #...N
* ...N
* ~~~
* @param filename
* @return success=array of RelocationEntry, failure=NULL
*/
RelocationEntry **prefixes_read(const char *filename) {
size_t i = 0;
int record_count = 0;
int parity = 0;
FILE *fp = fopen(filename, "r");
if (!fp) {
fprintf(SYSERROR);
return NULL;
}
RelocationEntry **entry = NULL;
char line[BUFSIZ];
memset(line, '\0', BUFSIZ);
while (fgets(line, BUFSIZ, fp) != NULL) {
if (isempty(line)) {
continue;
}
record_count++;
}
rewind(fp);
// Initialize the relocation entry array
if (record_count == 0) {
return NULL;
}
parity = record_count % 2;
if (parity != 0) {
fprintf(stderr, "%s: records are not divisible by 2 (got: %d %% 2 = %d)\n", filename, record_count, parity);
return NULL;
}
record_count /= 2;
entry = (RelocationEntry **)calloc(record_count + 1, sizeof(RelocationEntry *));
if (!entry) {
return NULL;
}
for (int i = 0; i < record_count; i++) {
entry[i] = (RelocationEntry *) calloc(1, sizeof(RelocationEntry));
if (!entry[i]) {
return NULL;
}
}
int do_prefix = 0;
int do_path = 0;
while (fgets(line, BUFSIZ, fp) != NULL) {
char *wtf = line;
if (isempty(line)) {
continue;
}
if (startswith(line, "#") == 0) {
do_prefix = 1;
}
else {
do_path = 1;
}
// Allocate a relocation record
if (!entry[i]) {
fclose(fp);
return NULL;
}
if (do_prefix) {
// Populate prefix data (a prefix starts with a #)
entry[i]->prefix = (char *) calloc(strlen(line) + 1, sizeof(char));
if (!entry[i]->prefix) {
fclose(fp);
return NULL;
}
strncpy(entry[i]->prefix, line, strlen(line));
// Remove prefix delimiter and whitespace
strchrdel(entry[i]->prefix, "#");
entry[i]->prefix = strip(entry[i]->prefix);
do_prefix = 0;
continue;
}
else if (do_path) {
// Populate path data
entry[i]->path = (char *) calloc(strlen(line) + 1, sizeof(char));
if (!entry[i]->path) {
fclose(fp);
return NULL;
}
strncpy(entry[i]->path, line, strlen(line));
entry[i]->path = strip(entry[i]->path);
do_path = 0;
}
i++;
}
fclose(fp);
return entry;
}
int relocate(const char *_filename, const char *_oldstr, const char *_newstr) {
int returncode;
Process *proc = NULL;
char *oldstr = strdup(_oldstr);
char *newstr = strdup(_newstr);
char *filename = strdup(_filename);
char cmd[PATH_MAX];
memset(cmd, '\0', sizeof(cmd));
sprintf(cmd, "reloc \"%s\" \"%s\" \"%s\" \"%s\"", oldstr, newstr, filename, filename);
// sanitize command
strchrdel(cmd, "&;|");
shell(&proc, SHELL_OUTPUT, cmd);
if (!proc) {
free(oldstr);
free(newstr);
free(filename);
return -1;
}
returncode = proc->returncode;
if (returncode != 0 && proc->output) {
fprintf(stderr, proc->output);
}
shell_free(proc);
free(oldstr);
free(newstr);
free(filename);
return returncode;
}
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