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/**
* @file relocation.c
*/
#include "relocation.h"
#include "str.h"
/**
* Replace all occurrences of `target` with `replacement` in `original`
*
* ~~~{.c}
* char *str = (char *)calloc(100, sizeof(char));
* strcpy(str, "This are a test.");
* replace_text(str, "are", "is");
* // str is: "This is a test."
* free(str);
* ~~~
*
* @param original string to modify
* @param target string value to replace
* @param replacement string value
*/
void replace_text(char *original, const char *target, const char *replacement) {
char buffer[OMC_BUFSIZ];
char *tmp = original;
memset(buffer, 0, sizeof(buffer));
while (*tmp != '\0') {
if (!strncmp(tmp, target, strlen(target))) {
size_t replen;
char *stop_at = strchr(tmp, '\n');
if (stop_at) {
replen = (stop_at - tmp);
} else {
replen = strlen(replacement);
}
strcat(buffer, replacement);
strcat(buffer, "\n");
tmp += replen;
} else {
strncat(buffer, tmp, 1);
}
tmp++;
}
strcpy(original, buffer);
}
/**
* Replace `target` with `replacement` in `filename`
*
* ~~~{.c}
* file_replace_text("/path/to/file.txt, "are", "is");
* ~~~
*
* @param filename path to file
* @param target string value to replace
* @param replacement string
*/
void file_replace_text(const char* filename, const char* target, const char* replacement) {
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
fprintf(stderr, "unable to open for reading: %s\n", filename);
return;
}
char buffer[OMC_BUFSIZ];
char tempfilename[] = "tempfileXXXXXX";
FILE *tfp = fopen(tempfilename, "w");
if (tfp == NULL) {
fprintf(stderr, "unable to open temporary fp for writing: %s\n", tempfilename);
fclose(fp);
return;
}
// Write modified strings to temporary file
while (fgets(buffer, sizeof(buffer), fp)) {
if (strstr(buffer, target)) {
replace_text(buffer, target, replacement);
}
fputs(buffer, tfp);
}
fclose(fp);
fclose(tfp);
// Replace original with modified copy
remove(filename);
rename(tempfilename, filename);
}
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