#include "common.h"
#include "utils_subst.h"
-char *subst (char *buf, size_t buflen, const char *string, size_t off1, size_t off2,
- const char *replacement)
-{
- char *out = buf;
-
- char const *front;
- char const *back;
- size_t front_len;
- size_t replacement_len;
- size_t back_len;
-
- if ((NULL == buf) || (0 == buflen) || (NULL == string) || (NULL == replacement))
- return NULL;
-
- size_t string_len = strlen (string);
- if ((off1 > string_len) || (off2 > string_len) || (off1 > off2))
- return NULL;
-
- front = string;
- back = string + off2;
- front_len = off1;
- replacement_len = strlen (replacement);
- back_len = strlen (back);
-
- if (front_len >= buflen) {
- front_len = buflen - 1;
- replacement_len = 0;
- back_len = 0;
- } else if ((front_len + replacement_len) >= buflen) {
- replacement_len = buflen - (front_len + 1);
- back_len = 0;
- } else if ((front_len + replacement_len + back_len) >= buflen) {
- back_len = buflen - (front_len + replacement_len + 1);
- } else {
- buflen = front_len + replacement_len + back_len + 1;
- }
- assert ((front_len + replacement_len + back_len) == (buflen - 1));
-
- if (front_len != 0) {
- sstrncpy (out, front, front_len + 1);
- out += front_len;
- }
-
- if (replacement_len != 0) {
- sstrncpy (out, replacement, replacement_len + 1);
- out += replacement_len;
- }
-
- if (back_len != 0) {
- sstrncpy (out, back, back_len + 1);
- out += back_len;
- }
-
- out[0] = 0;
- return buf;
+char *subst(char *buf, size_t buflen, const char *string, size_t off1,
+ size_t off2, const char *replacement) {
+ char *out = buf;
+
+ char const *front;
+ char const *back;
+ size_t front_len;
+ size_t replacement_len;
+ size_t back_len;
+
+ if ((NULL == buf) || (0 == buflen) || (NULL == string) ||
+ (NULL == replacement))
+ return NULL;
+
+ size_t string_len = strlen(string);
+ if ((off1 > string_len) || (off2 > string_len) || (off1 > off2))
+ return NULL;
+
+ front = string;
+ back = string + off2;
+ front_len = off1;
+ replacement_len = strlen(replacement);
+ back_len = strlen(back);
+
+ if (front_len >= buflen) {
+ front_len = buflen - 1;
+ replacement_len = 0;
+ back_len = 0;
+ } else if ((front_len + replacement_len) >= buflen) {
+ replacement_len = buflen - (front_len + 1);
+ back_len = 0;
+ } else if ((front_len + replacement_len + back_len) >= buflen) {
+ back_len = buflen - (front_len + replacement_len + 1);
+ } else {
+ buflen = front_len + replacement_len + back_len + 1;
+ }
+ assert((front_len + replacement_len + back_len) == (buflen - 1));
+
+ if (front_len != 0) {
+ sstrncpy(out, front, front_len + 1);
+ out += front_len;
+ }
+
+ if (replacement_len != 0) {
+ sstrncpy(out, replacement, replacement_len + 1);
+ out += replacement_len;
+ }
+
+ if (back_len != 0) {
+ sstrncpy(out, back, back_len + 1);
+ out += back_len;
+ }
+
+ out[0] = 0;
+ return buf;
} /* subst */
-char *asubst (const char *string, int off1, int off2, const char *replacement)
-{
- char *buf;
- int len;
+char *asubst(const char *string, int off1, int off2, const char *replacement) {
+ char *buf;
+ int len;
- char *ret;
+ char *ret;
- if ((NULL == string) || (0 > off1) || (0 > off2) || (off1 > off2)
- || (NULL ==replacement))
- return NULL;
+ if ((NULL == string) || (0 > off1) || (0 > off2) || (off1 > off2) ||
+ (NULL == replacement))
+ return NULL;
- len = off1 + strlen (replacement) + strlen (string) - off2 + 1;
+ len = off1 + strlen(replacement) + strlen(string) - off2 + 1;
- buf = malloc (len);
- if (NULL == buf)
- return NULL;
+ buf = malloc(len);
+ if (NULL == buf)
+ return NULL;
- ret = subst (buf, len, string, off1, off2, replacement);
- if (NULL == ret)
- free (buf);
- return ret;
+ ret = subst(buf, len, string, off1, off2, replacement);
+ if (NULL == ret)
+ free(buf);
+ return ret;
} /* asubst */
-char *subst_string (char *buf, size_t buflen, const char *string,
- const char *needle, const char *replacement)
-{
- size_t needle_len;
- size_t i;
-
- if ((buf == NULL) || (string == NULL)
- || (needle == NULL) || (replacement == NULL))
- return (NULL);
-
- needle_len = strlen (needle);
- sstrncpy (buf, string, buflen);
-
- /* Limit the loop to prevent endless loops. */
- for (i = 0; i < buflen; i++)
- {
- char temp[buflen];
- char *begin_ptr;
- size_t begin;
-
- /* Find `needle' in `buf'. */
- begin_ptr = strstr (buf, needle);
- if (begin_ptr == NULL)
- break;
-
- /* Calculate the start offset. */
- begin = begin_ptr - buf;
-
- /* Substitute the region using `subst'. The result is stored in
- * `temp'. */
- begin_ptr = subst (temp, buflen, buf,
- begin, begin + needle_len,
- replacement);
- if (begin_ptr == NULL)
- {
- WARNING ("subst_string: subst failed.");
- break;
- }
-
- /* Copy the new string in `temp' to `buf' for the next round. */
- strncpy (buf, temp, buflen);
- }
-
- if (i >= buflen)
- {
- WARNING ("subst_string: Loop exited after %zu iterations: "
- "string = %s; needle = %s; replacement = %s;",
- i, string, needle, replacement);
- }
-
- return (buf);
+char *subst_string(char *buf, size_t buflen, const char *string,
+ const char *needle, const char *replacement) {
+ size_t needle_len;
+ size_t i;
+
+ if ((buf == NULL) || (string == NULL) || (needle == NULL) ||
+ (replacement == NULL))
+ return NULL;
+
+ needle_len = strlen(needle);
+ sstrncpy(buf, string, buflen);
+
+ /* Limit the loop to prevent endless loops. */
+ for (i = 0; i < buflen; i++) {
+ char temp[buflen];
+ char *begin_ptr;
+ size_t begin;
+
+ /* Find `needle' in `buf'. */
+ begin_ptr = strstr(buf, needle);
+ if (begin_ptr == NULL)
+ break;
+
+ /* Calculate the start offset. */
+ begin = begin_ptr - buf;
+
+ /* Substitute the region using `subst'. The result is stored in
+ * `temp'. */
+ begin_ptr =
+ subst(temp, buflen, buf, begin, begin + needle_len, replacement);
+ if (begin_ptr == NULL) {
+ WARNING("subst_string: subst failed.");
+ break;
+ }
+
+ /* Copy the new string in `temp' to `buf' for the next round. */
+ strncpy(buf, temp, buflen);
+ }
+
+ if (i >= buflen) {
+ WARNING("subst_string: Loop exited after %" PRIsz " iterations: "
+ "string = %s; needle = %s; replacement = %s;",
+ i, string, needle, replacement);
+ }
+
+ return buf;
} /* char *subst_string */
-
-/* vim: set sw=4 ts=4 tw=78 noexpandtab : */
-
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